There is another advantage of DC: it's more efficient in transporting energy at parity of wire thickness, because instead of a sine wave you have a "full" utilization of the dynamic capability of the conductor.
What limits the maximum current in a bulk conductor is the produced joule heat, which is proportional to the square of the current (or voltage). Doing a bit of math, integrating the square of a sine wave and maximizing it, it turns out that the joule heat produced by a sine signal compared to a DC signal of the equivalent trasnported energy, is higher.
Yes. Whatever you end up choosing as specialty - make sure you start working IN YOUR FIELD, no matter the initial salary. If you weer into some "collateral" career, like IT, you run the risk of cementing it there.
If you go for digital electronics, I would suggest to spend some time in academia instead of going for the industry immediately after graduation. That way you can specialize in some up-and-coming technology rather than doing HVDL for some corp. HVDL is cool stuff, of course, but you will get bored afte a couple of years, and your career won't ever be very stable- you will always run the risk of being outsourced. It's a bit like the programming job in IT.
Said all that, I wish you the best of luck. And keep to your field, always.
The loss is due to low voltage/high current --> high joule loss.
So what you need to achieve is high voltage. But in the past, that wasn't possible with DC, because there was no _efficient_ way to transform the voltage/current aspect of the power line for DC, only for AC.
First of all, let me tell you that Tesla is one of my role models. He is one of the reasons I studied electrical engineering - with a passion. And AC, if you want, is the "winner" for all intents and purposes. The future really validated Tesla's AC system. There have been other folks that helped the adoption of the AC system, like Proteus, another role model for me.
Said all that however, high-voltage DC, a transport technology that starts to make sense nowadays, thanks to high-power solid-state switching elements, has many advantages over AC in terms of losses and cable utilization. You can transport more energy via DC than AC, across the same thickness cable. And you have practically no losses due to parasitic capacitances and inductances. The corona effect is much easier to control, too.
So, if I was forced at gunpoint to make a prediction for the electricity transportation in 150 years from now, I'd say hihg-voltage DC.
Your post has given me some unexpected insights. Thank you very much. Yes, some of my friends have been blind from birth, but most have become blind as adults (mostly as a side effect of diabetes, if I understand correctly).
But I really didn't expect/know that the occipital region of the cortex is helping read braille - I imagine this is in those individuals that have been blind from birth? This is kinda implied, but I'm not sure from your post.
As a neuropsychology student, do you think you'll work with this kind of stuff much?
...when I read about advances in neural-electrical interfacing, I hope for a quick solution to the problem of blindness. I have so many friends that would be even more creative and productive, if they only could see.
My mother is becoming blind, too, and it's breaking my heart to see her like that. I hope an affordable implantable camera, interfaced to the vision centers, will come in the near future. Nothing fancy, just B&W at low resolution with no greyscale, would do miracles.
Did you hear that "music"? I say if your toddler (if you have a toddler, that is) would push the keys of a synth randomly, he/she would make a more sensible tune.
Besides, half a dosen notes doesn't make a musical piece. Or else, I have a symphony hidden in my spaghetti.
You must be effing kidding (and by "you" I don't mean you in person, but rather, in general, and probably mostly the italian dude with the laptop and imagination). That music is really NOT worth hiding! Not in a painting that took many months to complete!
Well, if you're thinking about that 2nd language, consider chinese (mandarin). That's apparently the rising empire. They have the numbers, and now the're getting some quality, too: some of the best students at my uni are from china. Sure, there are many woodheads, too, but I'd say the chinese guys are pretty good. I am amazed at the thought of what 1.5 billion people can churn out in terms of talent, given the correct education infrastructure. Amazed and worried.
Well, there's one thing you didn't take into consideration (not a surprise, it only bites in the long run): battery. How I love when gadgets have the battery built-in, so you have no chance to replace it yourself.
This faq can be useful if anyone is suckered into buying an iPhone.
OK, so Finns are suckers for anything that is "cool" abroad. But they're used to not having their phones locked to any operator. This has been the way of doing things here since mobile phones existed, and in Scandinavia, they have been around a long time. Finland was the first country in the world where mobile phones reached a 70% market penetration.
Somehow I doubt Apple is going to undo the finnish expectations.
For me, it would be compelling if it would be possible to have about 10-15 DVD movies worth on a Bluray disk. Like, a whole season of a show, on one disk.
I completely agree with you. That's why I was wondering why would someone buy such toys for kids. For some reason, someone thought I was flaming? I just think exactly like you do, just expressed myself differently.
Forget the chemical they were coated with for a second. But how on earth does a toy for children, that has parts easily removed and very easily swallowed, get bought for children? (and notice how carefully I tried to word this, not trying to imply that the manufacturer approved the use of such toys for children (they may or may not have), but allowing for the possibility that the towy were marketed for a more adult demographic (8-12) and it was the parents' bad call to buy them for toddlers) Somebody is crazy here.
Yeah, that interview was pathetic. BUT... that was about the only time when I thought he was actually right about the iPhone, being way, way overrated and over over over expensive.
Good luck with your exam tomorrow. Don't forget to rest - hours stolen from night-time sleep are fool's gold. I should know, that's how I messed up my last exam.
You need publicity, yes. Can you imagine a marketing/PR/promotion company doing that? So you pay them for the promotion and don't sell your soul to the label? I can imagine such a scenario.
Mod parent up to... +10. I'm so tired of the same old story "they got the publicity thanks to the label, and so for a band is impossible to achieve this without a label's backing". Get off of it already. It's been said before, and it was as wrong then as it is now. All a band needs is publicity, and that has nothing to do with a discographic house. They'd want you to believe it has, of course.
...that I have nothing to do with the universe of social sites and such. From the sound of it all, I am missing nothing at all, eccept an opportunity to waste precious time.
Slashdot Mirror
There is another advantage of DC: it's more efficient in transporting energy at parity of wire thickness, because instead of a sine wave you have a "full" utilization of the dynamic capability of the conductor.
What limits the maximum current in a bulk conductor is the produced joule heat, which is proportional to the square of the current (or voltage). Doing a bit of math, integrating the square of a sine wave and maximizing it, it turns out that the joule heat produced by a sine signal compared to a DC signal of the equivalent trasnported energy, is higher.
Yes. Whatever you end up choosing as specialty - make sure you start working IN YOUR FIELD, no matter the initial salary. If you weer into some "collateral" career, like IT, you run the risk of cementing it there.
If you go for digital electronics, I would suggest to spend some time in academia instead of going for the industry immediately after graduation. That way you can specialize in some up-and-coming technology rather than doing HVDL for some corp. HVDL is cool stuff, of course, but you will get bored afte a couple of years, and your career won't ever be very stable- you will always run the risk of being outsourced. It's a bit like the programming job in IT.
Said all that, I wish you the best of luck. And keep to your field, always.
The loss is due to low voltage/high current --> high joule loss.
So what you need to achieve is high voltage. But in the past, that wasn't possible with DC, because there was no _efficient_ way to transform the voltage/current aspect of the power line for DC, only for AC.
First of all, let me tell you that Tesla is one of my role models. He is one of the reasons I studied electrical engineering - with a passion. And AC, if you want, is the "winner" for all intents and purposes. The future really validated Tesla's AC system. There have been other folks that helped the adoption of the AC system, like Proteus, another role model for me.
Said all that however, high-voltage DC, a transport technology that starts to make sense nowadays, thanks to high-power solid-state switching elements, has many advantages over AC in terms of losses and cable utilization. You can transport more energy via DC than AC, across the same thickness cable. And you have practically no losses due to parasitic capacitances and inductances. The corona effect is much easier to control, too.
So, if I was forced at gunpoint to make a prediction for the electricity transportation in 150 years from now, I'd say hihg-voltage DC.
I completely agree. I have been thinking the same for some time, but it seems so popular to bash Idols for some reason.
Very interesting. Especially the fact that you went on a limb (I think this is laudable, shows courage) to estimate some future developments.
Why do you think the computer you mention would be a quantum computer?
Your post has given me some unexpected insights. Thank you very much. Yes, some of my friends have been blind from birth, but most have become blind as adults (mostly as a side effect of diabetes, if I understand correctly).
But I really didn't expect/know that the occipital region of the cortex is helping read braille - I imagine this is in those individuals that have been blind from birth? This is kinda implied, but I'm not sure from your post.
As a neuropsychology student, do you think you'll work with this kind of stuff much?
...when I read about advances in neural-electrical interfacing, I hope for a quick solution to the problem of blindness. I have so many friends that would be even more creative and productive, if they only could see.
My mother is becoming blind, too, and it's breaking my heart to see her like that. I hope an affordable implantable camera, interfaced to the vision centers, will come in the near future. Nothing fancy, just B&W at low resolution with no greyscale, would do miracles.
You're right. I got my engineering notation wrong.
That's a large enough amount that even I might dust off my old Java skiilz..
Did you hear that "music"? I say if your toddler (if you have a toddler, that is) would push the keys of a synth randomly, he/she would make a more sensible tune.
Besides, half a dosen notes doesn't make a musical piece. Or else, I have a symphony hidden in my spaghetti.
You must be effing kidding (and by "you" I don't mean you in person, but rather, in general, and probably mostly the italian dude with the laptop and imagination). That music is really NOT worth hiding! Not in a painting that took many months to complete!
Or, maybe it was worth hiding...
Well, if you're thinking about that 2nd language, consider chinese (mandarin). That's apparently the rising empire. They have the numbers, and now the're getting some quality, too: some of the best students at my uni are from china. Sure, there are many woodheads, too, but I'd say the chinese guys are pretty good. I am amazed at the thought of what 1.5 billion people can churn out in terms of talent, given the correct education infrastructure. Amazed and worried.
Well, there's one thing you didn't take into consideration (not a surprise, it only bites in the long run): battery. How I love when gadgets have the battery built-in, so you have no chance to replace it yourself.
This faq can be useful if anyone is suckered into buying an iPhone.
OK, so Finns are suckers for anything that is "cool" abroad. But they're used to not having their phones locked to any operator. This has been the way of doing things here since mobile phones existed, and in Scandinavia, they have been around a long time. Finland was the first country in the world where mobile phones reached a 70% market penetration.
Somehow I doubt Apple is going to undo the finnish expectations.
Screen turns into a smudgy piece of shit after a few minutes of use: | YES | NO
See, now there's a feature where the iPhone beats the Nokia E70.
*ducks*
For me, it would be compelling if it would be possible to have about 10-15 DVD movies worth on a Bluray disk. Like, a whole season of a show, on one disk.
I completely agree with you. That's why I was wondering why would someone buy such toys for kids. For some reason, someone thought I was flaming? I just think exactly like you do, just expressed myself differently.
Forget the chemical they were coated with for a second. But how on earth does a toy for children, that has parts easily removed and very easily swallowed, get bought for children? (and notice how carefully I tried to word this, not trying to imply that the manufacturer approved the use of such toys for children (they may or may not have), but allowing for the possibility that the towy were marketed for a more adult demographic (8-12) and it was the parents' bad call to buy them for toddlers) Somebody is crazy here.
Yeah, that interview was pathetic. BUT... that was about the only time when I thought he was actually right about the iPhone, being way, way overrated and over over over expensive.
Good luck with your exam tomorrow. Don't forget to rest - hours stolen from night-time sleep are fool's gold. I should know, that's how I messed up my last exam.
You need publicity, yes. Can you imagine a marketing/PR/promotion company doing that? So you pay them for the promotion and don't sell your soul to the label? I can imagine such a scenario.
Mod parent up to... +10. I'm so tired of the same old story "they got the publicity thanks to the label, and so for a band is impossible to achieve this without a label's backing". Get off of it already. It's been said before, and it was as wrong then as it is now. All a band needs is publicity, and that has nothing to do with a discographic house. They'd want you to believe it has, of course.
Actually, kids to think of pets as their peers. It's just part of how they see the world.
...that I have nothing to do with the universe of social sites and such. From the sound of it all, I am missing nothing at all, eccept an opportunity to waste precious time.
Oh, yeah, slashdot....