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New Electrode Lets Batteries Charge In 10 Seconds
Al writes "A new lithium-ion electrode allows batteries to be charged and discharged in 10 seconds flat. Developed by Gerbrand Ceder, a professor of materials science at MIT, it could be particularly useful where rapid power bursts are needed, such as for hybrid cars, but also for portable electronic devices. In testing, batteries incorporating the electrodes discharged in just 10 seconds. In comparison, the best high-power lithium-ion batteries today discharge in a minute and a half, and conventional lithium-ion batteries, such as those found in laptops, can take hours to discharge. The new high rate electrode, the researchers calculate, would allow a one-liter battery based on the material to deliver 25,000 watts, or enough power for about 20 vacuum cleaners."
...how many libraries of congress per square inch is that, again?
That sucks.
I read Slashdot for the headlines, because the headlines, unlike the articles, are usually original and never duplicated
> deliver 25,000 watts, or enough power for about 20 vacuum cleaners."
What could possibly go wrong with that!!??
Sig Battery depleted. Reverting to safe mode.
Great, by the time I have backed out of the driveway I'll need to recharge it.
for about 10 sec.
being able to charge in 10 seconds would mean you could fuel an electric car as fast as a gasoline one. i hope this is for real
fantastic, now they can start putting Ipod charging stations in airports.
So 1 vacuum cleaner consumes 1.25kW? I didn't realise they were so power hungry. Anyway, a more important number is the capacity, how many Wh (or mAh) do these things hold? Is it 25kW for 10s? or for 1 hour? or what?
There can't be a huge lot of commercial use cases for rapid discharge. Tasers?
Rapid charge, on the other hand, makes a lot of applications much easier to market. Gasoline has one big advantage over electric powered cars - you can drive into and out of a gas station in 3 minutes as opposed to having to plug the car in overnight.
The cyclon X cells I used to power a robot I built a few years back can deliver 500 amps -- enough to melt a 10 gauge wire I accidentally dropped across the terminals. Not bad for something about four times the heft of a D cell. The claim sounds like hype, since it's energy density, not discharge rate that everyone is trying to ramp up lately.
Brackets contain world's first nanosig, highly magnified:[.]
discharging or charging that battery in 10 seconds creates a CRAPLOAD of heat. This will shorten it's lifespan drastically.
They fixed that yet?
first thought?
Railgun
Invaders must die
Where does the heat go on rapid discharge?
Or is this the Sony method of rapid discharge?
accidentally?
riiiiight.
Invaders must die
For how many microseconds, I wonder. I don't doubt the new electrodes might have some use. But what is holding up wide spread adoption of battery cars is not just the charging time. It is also the total energy that can be stored in a battery relative to its weight. That is the tough nut to crack.
a page of comments and no one has yet said:
"10 seconds? the average /. geek discharges faster than that"
sigh.
I'm fairly surprised to hear that vacuum cleaners use that much power - 1.25kw each is about 1.6 horsepower each. That should be enough for your vacuum cleaners to do 0-60 in the 10 seconds worth of battery you've got...
Bill Stewart
New Fast-Compression-only CPR http://preview.tinyurl.com/dy575ks
Twenty vacuum cleaners? How much is that in burning Libraries of Congress?
Seriously, what is with "vacuum cleaners" as a unit of comparative measurement? Running for how long? Cleaning a carpet how dirty? Upright or canister? With motorized attachments or no?
The article describes a new technology for speedy discharge of batteries which is not the same as charging
Wikipedia has a picture of one. These can even charge and discharge in less than a second.
Wow, now we can expect to see spectacular laptop fires hot enough to burn through an engine block. Where can I get some of those batteries? Sony?
I'm fairly surprised to hear that vacuum cleaners use that much power
Have you ever noticed the lights dim when you turn one on? Vacuum pumps, especially ones that have to suck air through a bag filled with dust and lint, are pretty power hungry.
How can I believe you when you tell me what I don't want to hear?
Actually, the big thing about electric driving isn't getting started in the first place, it's reclaiming the energy when you have to stop (at least for inner city driving.) If you have a battery that is bordering on a supercapacitor to dump energy into, you can reclaim nearly all of the stopping energy into the battery to use to start again. Given that there are 745 watts/hp, a battery capable of a charge rate of 25KW gives you 33 horsepower of braking capacity with one cell. Get 3 of them in a car and you can reclaim 100hp during a stop, which would be good for all but the most grueling emergency stops (depending on the weight of the car).
Was that 25,000 Watt-seconds?
Do not mock my vision of impractical footwear
Because of the electronic punch that they pack, gram for gram, lithium-ion batteries are the most common rechargeable batteries found in consumer electronics, such as laptops. However, they take a long time to charge and researchers have assumed until now that there was a speed limit on the lithium ions and electrons that pass through the batteries to form an electrochemical circuit. The problem with existing lithium-ion batteries is the way ions passed through minuscule tunnels, whose entrances are present at the surface of the material. The team discovered that to get into these channels, the ions had to be positioned directly in front of the tunnel entrances - if they were not, they could not get through. The solution found by Gerbrand Ceder at the Massachusetts Institute of Technology was to engineer the material such that it has a so-called "beltway" that guides the ions towards the tunnel entrances. A small cellphone battery can be recharged in just 10 seconds thanks to the improved ion flow and a large battery that would be used to power a plug-in hybrid electric car could be recharged in just five minutes, compared to up to six or eight hours at present. Because there are relatively few changes to the standard manufacturing process, Ceder believes the new battery material could make it to market within two to three years.
Back in my day we called those "capacitors".
Now get off my lawn!
-- Will program for bandwidth
But keep in mind, the first second is going to be startup, which, for an electric motor, can sometimes draw twice as much current as when it's running. That's going to skew your average significantly when you're only talking about a 10 second runtime.
"City hall" in German is "Rathaus" Kinda explains a few things......
My last laptop battery was faster than this after a few years, it would completely discharge in 5 seconds, not a slow 10 seconds!
Vacuum cleaners are rated in "Amps" of power. you don't have a good vacuum unless it's rated at 10 amps or more. Of course this leads vacuum companies to design really inefficient motors that pull huge amounts of energy just to get the Amp Rating up high.
We are Dead Stars looking back Up at the Sky
You probably would want capacitors for those, with other pulse-shaping devices. In fact, this is what they actually do. Ten seconds of discharge is way too slow for a rail gun.
I had but a simple dream, to destroy all humans.
new electric bass boat, the Chevy Fibrillator ...
"Not an actor, but he plays one on TV."
And Cylon cells? Hoo boy.
Whats that in Libraries of Congress (LoC)?
"In testing, batteries incorporating the electrodes discharged in just 10 seconds."
Sweet, now my laptop will get up to a full 10 seconds of use until I have to recharge!
THE MAGIC WORDS ARE SQUEAMISH OSSIFRAGE
Pentium 4 -based laptop?
A battery that lasts on 10 seconds ;-)
You just gave me an amazing hadron!
Now back to my calculations.
From many of the comments, most as usual didn't rtfa. It explains most of what people commented on anyways so I'll just make a summary.
This breakthrough, as implied, is for high discharges which is useful as a replacement for ultracapacitors or possibly power tools (and weapons?) which requires high short term power. It isn't a major breakthrough but it is still nice. It has a lower capacity than normal and there is a possibility of fast charging but more research is needed. The reference to cars was more of a future possibly than a target.
Say you have a train or tram which draws power from the grid to accelerate then turns kinetic energy into heat to stop. If it can dump power into batteries fast it can save power overall.
http://michaelsmith.id.au
I thought of writing I disclaimer saying as much, but my submit button discharged too fast.
Invaders must die
You know they have drugs for that. The blue pill and all.
Make sure everyone's vote counts: Verified Voting
Anyone else notice this from the article?
Wouldn't it be something if someone trademarks this use of lithium diphosphate on targeted crystal faces as, oh, I dunno, dilithium crystals?
First, transparent aluminum, and now this!
Program Intellivision!
An interesting hypothesis! I wonder if they have done any preliminary testing as to the viabilty of getting past the POST\1
Invaders must die
Yes. More Power! Yes, Yes, Yes!
Can You Feel It? Can You Feel The Power Yet?
My Plan Is Working Perfectly.
Soon, Very Soon, I Will Have All The Power I Need To Take Over Slashdot... and then... THE WORLD!!
Ha ha!
Ha ha haha ha!
My shop vac is rated in gallons. And so is my girlfriend.
Fascism trolls keeping me up every night. When I starts a preachin', he HITS ME WITH HIS REICH!
"no no, it can grip it by the husk"
I prefer to see how deep the rabbit hole goes!
Invaders must die
Critical hit! It's super effective! END USER fainted!
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but for a man-portable railgun, the batteries are used to charge the capacitors, all in the back pack.
1250 W is not actually that much for a hoover. Most mid- to high-end models will use 2000 W or more, at least on the highest setting.
Laser guns anyone?
You should think more along the lines of a Beowulf Cluster of Roombas.
This issue is a bit more complicated than you think.
But I thought the only thing that could put out that many watts so quickly, is a lightning bolt!
Wait'll the Libyans hear about this!
I suspect dilithium came from a hint dropped in somebody's ear that regular old lithium was a critical component of hydrogen bombs. But just as regular old triticale, a grain that actually exists, wasn't good enough for Star Trek and so had to be supervened by quadrotriticale in The Trouble with Tribbles, the critical element lithium without which hydrogen bombs couldn't be made probably had to be expanded to dilithium to meet the demands of starship engines. (It's never occurred to me before now but I guess if they ever had to do it again it would have been octo-something.)
Brackets contain world's first nanosig, highly magnified:[.]
Sure glad you take a power outlet everywhere you take your rail gun. Me I use batteries to charge my caps, portable death with a reasonable recharge rate.
yay
Mine has 1400 watts written on it in big letters. Amps X Volts = Watts
And did you exchange a walk on part in the war for a lead role in a cage? - Pink Floyd.
1200 Watt vacuum cleaners are standard.
signature is pants
Great. They suckered me into getting a riding lawnmower, now I gotta get a riding vacuum. What's next? Paying for downloading music?
How fast can they explode?
what recharges the capacitors though? the faster you can recharge the caps the faster you could fire another shot.
Doesn't dilithium mean there are 2 lithium atoms present? Whereas lithium diphosphate means there is one lithium atom and 2 phosphorous atoms.
Most people didn't really know the difference, and many companies didn't publicise the last one because (a) people are dumb and might think 200 watt nozzle suction is worse than 1500watt engine power, and (b) because it'd show their machines are crap.
Example - dysons when I was selling them had lower engine power than, say, hoover(1200 vs 2000 watts iirc), but had comparable or higher suction power because the suction didn't need to get through the walls of a bag & a bunch of filters.
End my 2 cents.
FTA:
"Ultimately, the energy capacity of lithium iron phosphate is lower than that of other lithium-ion battery materials, making Ceder's advance of limited value, says Jeff Dahn, a professor of physics at Dalhousie University, in Halifax, Nova Scotia. This battery is good for acceleration, but not as much for long range."
Emphasis mine. As has been pointed out above, the practical use for rapid-discharge is in conjunction with other types of high-density storage. I envision it as analogous to the RAM and HDD paradigm.
You Americans and your crazy low voltage power lines! Here in Australia, most wall outlets are rated (I believe) at 10 amps maximum, which equates to roughly 2kW. By a strange coincidence most kettles, vacuum cleaners etc. are roughly 2kW in power (and are sold by power output, not just amperage).
Rampant carbon sequestration destroyed the Dinosaurs' tropical paradise. I'm here to help repair the damage.
But for money, they dropped the p from platinum.
Pathological kinda promises Path + Logical - but instead, you get stuck with pathetic.
So is your mom.
It is curious that no one has noticed, or at least commented, that such a battery could be dangerous if not used properly. The standard EE model for a battery is a voltage source in series with a resistor. This is called the internal resistance of the battery, and its effect is to limit the current that can be delivered by the voltage source. All batteries have nonzero internal resistance, and for most batteries, that resistance is significant. There are many kinds of batteries that you can safely short, and nothing hazardous will happen as the battery discharges as rapidly as it can. In order for the battery described in this article to be able to deliver such significant power in such a short time, if it obeys the simple first-order model, it must have an extremely low internal resistance. That means that if such a battery is shorted with a conductor sufficiently robust not to vaporize, the current flow through the shorting conductor could generate sufficient heat so as to be a serious fire hazard. There are videos on youtube showing what happens to a laptop when its battery is artificially induced to discharge catastrophically. It isn't pretty, especially if the laptop were in your car trunk, your backpack, or under the seat in a commercial airplane. I remember back a zillion years ago when a roommate's car was frontally crunched. He decided to loop a chain around the front grill and mounts and try to pull the bodywork into shape using another car. The chain cut into the insulation of a battery cable (probably the started cable, which mysteriously was routed along the radiator mounts) which shorted the lead-acid 12V battery to the frame. A wreath of smoke emerged as the insulation on this rather substantial cable melted, burned, and vaporized. Fortunately the now-completely-junk vehicle didn't catch fire. I believe the internal resistance of an automobile lead-acid battery is somewhere less than 0.1 Ohm. Consider what the internal resistance must be for the battery in the article...
Until one of these batteries explodes in some guy's pocket and everyone raises a fuss about it.
You can't take the sky from me.
Was it Sony?
BOOM!
you use the batteries to charge up your capacitors duh
That's decent power for a "1 gallon" battery, but for how long can it provide that much power? 10 seconds? pfft.
Philippe Jose Farmer would be proud.
Wow, that's a lot of power. Here in America our outlets are rated at about 20 Amps. That translates to roughly 2kW. what a coincidence!
so thats what the kids call it these days
Assuming this is practical for production batteries, what I'd like to know is how using electrodes of this type would affect the overall lifespan of a battery in charge/discharge cycles. If it's dramatically shorter than current technology then it's not really very useful.
Are YOU using the TOOL, or is the TOOL using YOU? Think about it!
Can you PLEASE stop with these half-assed, incomplete analogies ?
to deliver 25,000 watts, or enough power for about 20 vacuum cleaners
OH, REALLY ? FOR HOW BLOODY LONG ??? A day, a month, the rest of your life ???
Without a time quantifier, the analogy is totally meaningless.
20 vacuum cleaners for 30 minutes each, assuming each vacuum cleaner consumes 2.5 Kwh. Now that MEANS something !
And just out of interest, why vacuum cleaners ? This is Slashdot, not Womans Weekly Online ... how many basement nerds actually know what a vacuum cleaner looks like ? That's something their mum's do when they are still asleep isn't it ?
Enough power for a Beowulf Cluster damnit ... something we can relate to !
well, here in india, wall outlets are rated at 15 amp maximum at 240 volts, equal to 3.6 kw. but only things like water/room heaters and air conditioners have ratings of 2kw and above.
Wealth is the gift that keeps on giving.
Then it probably needs to be replaced. :P
...but, in the case of consumer electronics, would I be concerned about rapid discharge? If anything, I'd *not* want that.
It would depend upon the thermal mass and conduction of the connector. I have a 3kw kettle and have no problem holding it while it heats the water.
They whose government reduces their essential liberties for temporary security, receive neither liberty nor security.
Example - dysons when I was selling them had lower engine power than, say, hoover(1200 vs 2000 watts iirc),
Having coincidentally tested my Dyson DC10 with a power meter just yesterday, I can tell you that the draw from mains is 1kw. Not sure what the official rating is, though.
power 20 vacuum cleaners. Ok, but for how many seconds ? ;)
Wow, that's a lot of power. Here in America our outlets are rated at about 20 Amps. That translates to roughly 2kW. what a coincidence!
The problem is, though, that drawing 20A/110V will heat up your wiring twice as much as drawing 10A/220V (assuming the same resistance), thus wasting twice as much to transmission losses. Also, the voltage fluctuations you'll see due to changing power demands are twice as large. So higher voltage == better.
Besides, here in the UK we get 240v x 13A = 3.1kW, so we beat you both. :)
The claim sounds like hype, since it's energy density, not discharge rate that everyone is trying to ramp up lately.
No, energy density and discharge rate are both problems. Lithium batteries are clear leaders in energy density (at least some of the more unusual varieties like lithium-iron phosphate), but they have very slow discharge. This means that to get the 500A you can easily get out of a single lead acid battery, you need something like 20 batteries working in parallel. And making more small cells is more expensive than fewer large ones. A typical EV power system based on LiFePO4 will want something to be able to provide something like 100v x 200A peak, which means 8 parallel banks each containing about 50 cells. With this new design, that can be cut to just 50 big cells, which will probably halve the cost of production.
Or put differently, if your wiring is good enough that they can safely take 20A in a 120V country (2400W), then in a 240V country, you get the choice between either installing the same wiring, and getting 4800W, or installing cheaper, thinner wiring and still get 2400W.
These cells will need remarkably good protection against internal and external shorts. They have the stored energy density of dynamite, but they don't have the long development of reduced sensitivity characteristics that make dynamite safe.
From scarped cliff or quarried stone she cries "A thousand types are gone, I care for nothing, no not one."
discharge in 10 seconds:
You should see a doctor. No, bad idea, don't see a doctor, call him on the phone.
In the UK, where we have 240v mains 2kw vacuum cleaners are common. They clean really well too - though the scenario in the return of the pink panther involving Inspector Closseu, a parrot and a vacuum cleaner is certainly a possibility.
In the UK 3kw appliances are common, especially kettles and electric heaters.
The GP is correct: Power is measured in watts, and "one horsepower" is 740-ish of them.
Current, on the other hand, is measured in amps.
You could have said "[] cleaners' motors draw a number of amps, and here in the US with our 120v mains, you'd need at least a 10amp motor..."
But, you cannot say "[] cleaners are rated in Amps of power". Makes no sense.
Why the parent is rated Informative is anyone's guess.
Bad form to reply to self, but anyhow...
/Opinion/, he said, passing an opinion.
/Informative/, to me, means "provides useful information". It should not mean
Interesting to see what this post gets tagged then.
--
cash-=2*p;
250kW/s/litre is 250x10^3/3600 which is 69.4W/hour.
Which seems about right.
You Americans and your crazy low voltage power lines! Here in Australia, most wall outlets are rated (I believe) at 10 amps maximum, which equates to roughly 2kW. By a strange coincidence most kettles, vacuum cleaners etc. are roughly 2kW in power (and are sold by power output, not just amperage).
It depends on the house. My house has a 20 A 240 V rating with a 10 A 240 V rating for the lights. Newer houses (well those from the 1970's on) can have two or more wall outlet isolation at the fuse box so if one set of wall outlets trip their fuse the wall outlets on the other fuse continue to work. Too bad if your TV and stereo are on the set of outlets that have tripped their fuse.
Actually many houses have separate power lines for heavier current drawing devices such as ovens, air conditioners and even bathroom heating lamps it really depends on what the electrician who wired the house was asked to do.
The highest rating power for most single phase devices or standard mains household appliances in Australia is 2400 Watts. This is so earlier built houses aren't exceeding the basic standard of 240 V 10 A.
Actually if you live in an older house that has rubber sheathed electrical cable get the cable replaced because over time this type of cable can go brittle or in some cases turns to liquid rubber. Note this is not just Australia this is world wide so people should be aware of this.
There ain't no such thing as proprietary standards only proprietary formats. Standards are by definition open.
In the UK we install the cheaper, thiner wiring but still get 4800W because we're strange and wire the outlets as a ring circuit, which effectively doubles the available cross sectional surface area of the conductor.
Syllable : It's an Operating System
The problem is, though, that drawing 20A/110V will heat up your wiring twice as much as drawing 10A/220V (assuming the same resistance), thus wasting twice as much to transmission losses. Also, the voltage fluctuations you'll see due to changing power demands are twice as large. So higher voltage == better.
Err No! Power dissipation in transmission cable is basically dependent on the impedance of the cable which is a function of mains frequency, capacitance to ground, resistance and inductance of the cable. Over long distances power lines at 60 Hz will be more lossy compared to 50 Hz however sometimes you want to have the cable warmer than the surrounding air especially if you want to prevent ice build up which in the colder part of the USA and Canada can actually save considerable amounts of money in overall maintenance. The problem you have is once you have decided on a mains frequency your whole county is stuck with it.
There are advantages and disadvantages when comparing 50 Hz to 60 Hz it just depends on what you are doing with it. As for power line voltages most transmission voltages are fairly standard world wide due to practicality. A course in power transmission lines can answer many questions but don't expect it to be easy.
There ain't no such thing as proprietary standards only proprietary formats. Standards are by definition open.
By a strange coincidence most kettles, vacuum cleaners etc. are roughly 2kW in power (and are sold by power output, not just amperage).
I just got a new Krups coffeemaker with a thermal carafe. It maxes out at 1200W, brews the coffee, then shuts off and stops wasting power. The vacuum-filled (heh) stainless carafe keeps the coffee warm. It brews faster than any other coffeemaker I've ever used. 2kW is simply not necessary.
The thermal carafe saves less power than you might imagine if you don't know what the fuck you're talking about, for the same reason your kettle doesn't really draw 2kW. Oh, it might do that for a fraction of a second, but then it heats up and the resistance rises, which reduces the draw. Meanwhile, P=VI, so it doesn't actually matter if your kettle is sold by amps or watts, it still comes out to a number of watts in the end. E=IR and all that.
Incidentally, in the USA most of our outlets are doubled. I don't know what it's like in the UK, but in the US having appliances that draw the entire capacity of the outlet is usually contraindicated. So in a 20A outlet, I don't really want more than a 15A coffeemaker. In fact, most household outlets are only 10A, so a 1200W coffeemaker is about the peak anyway - but for the same reasons your kettle doesn't actually pull 2kW, this thing doesn't actually pull 1.2kW.
"You're right," Fisheye says. "I should have set it on 'whip' or 'chop.'"
But for money, they dropped the p from platinum.
It's just pure! Welcome to our latinum. Notice it has no P in it...
"You're right," Fisheye says. "I should have set it on 'whip' or 'chop.'"
ACP or someone were looking at using car batteries to buffer high demand with base load. It would mean the electricity producers wouldn't need to have excess plant idling during low loads simply to deal with peak periods.
Deleted
Have you ever noticed the lights dim when you turn one on? Vacuum pumps, especially ones that have to suck air through a bag filled with dust and lint, are pretty power hungry.
If your lights dim when you turn on the vacuum cleaner your electrical wiring is undersized.
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That's just because so many of them read the book "Freud on the Materials and Subject of Peter Cottontail."
Apparently, the "Bunny Trail" is a symbolic representation of one's latent homosexual desires. It's quite an interesting read!
Random Thoughts From A Diseased Mind (Not For Dummies)
Actually what about the reverse?
Lightning rod -> capacitors -> fast-charge Li-ion == 1.21 Jigawatts!!
The Empire State Building no doubt gets hit with enough Lightning to go off the grid...
War as we knew it was obsolete
Nothing could beat complete denial
- Emily Haines
Surely this has already been achieved by Sony with their so-fast-discharging-it-explodes line of laptop batteries?
....Is a charging cable as big around as a manhole cover.
Regards;
I'm surprised nobody has pointed out how dangerous this is. Lithium batteries are a serious fire hazard already, and this just makes it much worse.
If you work out the energies involved, you'll find that if the terminals on the the "1-liter battery" mentioned in the summary are shorted out accidentally, it will heat itself up to the melting point of lithium in a few seconds.
Best-case scenario, the battery destroys itself and melts into a puddle of molten metal on the tabletop. Worst-case scenario, the aqueous electrolyte vaporizes and the battery explodes like a grenade.
This level of power output makes the battery Not A Consumer Item.
Apparently, the "Bunny Trail" is a symbolic representation of one's latent homosexual desires. It's quite an interesting read!
Is there a moderation for +1 Too Much Informative?
Do you have independent circuit breakers on each end of the ring? If not, a break in the ring could lead to 4800W through one leg of the ring, leading to a fire.
Here in the states we have to worry about which phase a particular circuit is on, so the ring configuration would be difficult to do safely. The odds of hooking opposite phases in the ring would be unacceptably high, although the only result would be a pair of breakers that would refuse to stay on (perhaps sparking rather magnificently when closed).
Tiller's Rule: Never use a word in written form that you've only heard and never read. You will end up looking foolish.
I think he meant I^R losses in the premise wiring, not in the transmission lines. His point, though, is valid - for the same frequency (hence the same impedance), doubling the voltage will halve the current but quarter the power lost in distribution.
To your point re: 50 vs 60 Hz - I wonder how the additional transmission losses at 60Hz compare to the efficiency gain you get in the transformers at either end? Typically higher frequencies allow for smaller and more efficient transformers. It would be interesting to see where the sweet spot is for a given configuration. I'd guess it'd be closer to 400Hz, but that's just my guess.
Tiller's Rule: Never use a word in written form that you've only heard and never read. You will end up looking foolish.
I've never heard of a 10A circuit or receptacle. Many outlets in the US are supplied via a 20A branch circuit using #12 copper, but are wired with 15A receptacles. This is legal according to the NEC code. The remainder are supplied via a 15A branch circuit using #14 copper. The 15A receptacles have the typical 'I I' look to them. 20A receptacles look more like 'I- I' where the neutral blade has a Tee shape. A 20A plug has the neutral lead rotated 90 degrees, so it'll fit in a 20A receptacle but not a 15A one. Similarly, a 15A plug will mate with a 20A receptacle. This chart shows various NEMA plug and receptacle configurations.
Tiller's Rule: Never use a word in written form that you've only heard and never read. You will end up looking foolish.
Hmm. Let's see. Consider a 1 meter long rail gun.
v is final velocity
a is acceleration
m is mass of the projectile.
W is power.
v = at
E = mv2/2
But
E = Wt
Equating these two Wt = mv2/2
v2 = 2Wt/m
But t=L/2v (from average velocity v(ave) = v/2)
v2 = 2WL/2vm
v3 = WL/m
v = cube root (WL/m)
So a 8 ram bullet ...
v = cube root (25000/.008)
= 146 m/s or about 500 ft/sec
Bit slow yet.
To get up to 2000 feet per second will take
64 times the power.
Won't worry about it this week.
The batteries may make recharging the capacitors
faster.
Let's see: to get a 700 m/s bullet (2200 fps)
E = mv2/2 .008 * 700^2 / 2
E =
= 2000 joules.
Your 1 liter battery could provide power for 12 bullets
per second. Not too shabby.
Third Career: Tree Farmer Second Career: Computer Geek First Career: Teacher, Outdoor Instructor, Photographer.
Amps are the amount of current, volts are the amount of "force". Watts = amps * volts. Sp a ten amp vaccuum in the US (120 volts) would be 1200 watts.
Most vaccuum companies rate their cleaner motors in horsepower these days. They want that "energy star" tag.
Free Martian Whores!
Turning on a 12 amp electric motor, in an average US home wired for ~100 amps, will cause voltages to dip momentarily.
Granted, most US homes' wiring systems *are* undersized considering the low voltage, but that's neither here nor there.
How can I believe you when you tell me what I don't want to hear?
Most electrical wiring is undersized in old construction. My lamp dims when I turn on my CRT monitor, and I have my Plasma TV and PS3 on separate outlets otherwise sometimes both shut off intermittently. I live in an apartment, so not much I can do about it.
Not really a super capacitor as they can charge / discharge instantly, but a fast charging battery. Many good uses! and The first one I can think of is R/C planes. If I could charge my Stryker's battery in 10 seconds, but fly for 15-20 min. I'm sold. Right now I have to charge @ 1C (1x the capacity of the battery) for about 45 min for a 15 minute flight (if I'm gentle on the throttle).
The second is Recharging a car battery. Right now, if you use the electric brake gear for going down hill in a prius you'll slowly charge up your battery. If you apply brakes, you charge up your battery. But if you apply brakes hard, the battery can't take all that charge at once, and you have to use the disc brakes. Think of saving around 30lbs per wheel in brakes! No extra parts, and practically 0 maintenance for the brake for the life of the car. This alone will save hundreds of lives as people don't check their brakes enough.
Third is drag racing e- vehicles. We allready know that from the likes of a T-0 or a Tesla that e- cars can be fast. What if you could make those cars basically have an electric "NOS" button? OH WHAT FUN!
I'm going to go clean my pants now, ty
How much is your data worth? Back it up now.
Supposedly electric well pumps have such a high initial draw that rigging them off batteries and/or small generators isn't presently feasible. If the grid goes down, most rural houses have no water beyond what's in the hot water tank and the pressure tank. Hopefully this type of research continues, as many rural home owners already have the space and motivation to generate their own power. Solving the well pump issue would be a major boost.
This could mean the tech basis for future electric jet engines, right?
This is just what we need to bring all those hand held energy projection weapon designs off the drawing board!
15 amps is the peak ratings. Or a continuos load, you are not allowed to draw more than 80% (or 12 amps).
The extra 2 amps are used to drive the beater head.
Power factor may affect things as well, but High-drain appliances seem to be designed to have a "good" power factor.
The title says "charge," but there is no discussion of quick charging, just lots of discharging talk. I for one would welcome a phone that charges in 10 seconds. But nobody is discussing that. Instead we have talk of railguns etc. Right.
Currently hooked on AMP
Okay, so it's ten seconds, not instantaneous, but the power is huge. Another aspect of such high charge rates is the "gas station" needs to be an electrical substation. The standard US house service is 240V, 200A (48KW), which will take about an hour to put a 50KWH charge into the battery, and that's if there's nothing else taking power in the house.
I'll leave the calculation of the power required to put 50KWH into a battery in ten seconds as an exercise for the reader, but it's big. I wouldn't want to be closer than maybe a kilometer if something "goes wrong."
Tag lost or not installed.
My bad, I guess I meant 15. I knew damned well it wasn't 20, because I've installed them (as well as the 220V outlets with the two flat spades, - -
"You're right," Fisheye says. "I should have set it on 'whip' or 'chop.'"
Vacuum cleaners are rated in "Amps" of power.
That depends on where you live. I was quite surprised when I set out to buy a vacuum cleaner in Canada, and found all those strange "10 amp" and "12 amp" stickers on them. Where I'm from, it's always watts.
In testing, batteries incorporating the electrodes discharged in just 10 seconds.
Bah, my laptop battery does that already.
Caveat Emptor is not a business model.
I am underwhelmed by this discovery. How is the idea different than Altairnano's Nanosafe battery? They developed theirs close to ten years ago. IT uses a nano eneneered electrode to eliminate the center barrier in a Li-On battery. Allowing a 150KWH battery to absorb complete charge in as little as 10 minutes. They have licensed theirs to A123 systems and are already producing them so this is kind of a day late and a dollar short. The only thing that makes this even notable is it will be able to compete with them thus lowering cost...
http://www.altairnano.com/profiles/investor/fullpage.asp?f=1&BzID=546&to=cp&Nav=0&LangID=1&s=236&ID=9294