I believe a Van de Graaff machine is an example of a current source not a voltage source. It supplies a constant current rather than constant voltage. When nothing is touching the machine it's looking at it's internal resistance (very high) in parallel with air (also very high). By Ohm's Law then the voltage referenced to ground is also very high since you're trying to drive a small current through a large impedance. The potential relative to ground is high enough that when you place a grounded object near the generator it causes breakdown and arcing. If you touch the machine, you're providing a much lower impedance path to ground hence greatly reducing the voltage but not really affecting the current.
Yes, current is what will kill you but I don't think the previous poster was incorrect in relating it to voltage as in most cases there is a fixed potential across the body. If that potential is high enough, or the person's internal resistance low enough, the current will be high enough to do damage.
Prior to that I noticed as the little droids that attached themselves to Obi-Wan's starfighterlost their gripthey flew off. Wouldn't there need to be some sort of atmosphere for that to happen?
Prior to that I noticed as the little droids that attached themselves to Obi-Wan's starfighter they flew off. Wouldn't there need to be some sort of atmosphere for that to happen?
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student server folders: nightly scripts to delete mp3, zip(sit rar etc) and exe(dmg bin etc)
/etc - and twice for that matter?
Why would you delete
I believe a Van de Graaff machine is an example of a current source not a voltage source. It supplies a constant current rather than constant voltage. When nothing is touching the machine it's looking at it's internal resistance (very high) in parallel with air (also very high). By Ohm's Law then the voltage referenced to ground is also very high since you're trying to drive a small current through a large impedance. The potential relative to ground is high enough that when you place a grounded object near the generator it causes breakdown and arcing. If you touch the machine, you're providing a much lower impedance path to ground hence greatly reducing the voltage but not really affecting the current.
Yes, current is what will kill you but I don't think the previous poster was incorrect in relating it to voltage as in most cases there is a fixed potential across the body. If that potential is high enough, or the person's internal resistance low enough, the current will be high enough to do damage.
Over what range is Ohm's law limited to?
Prior to that I noticed as the little droids that attached themselves to Obi-Wan's starfighter lost their grip they flew off. Wouldn't there need to be some sort of atmosphere for that to happen?
Prior to that I noticed as the little droids that attached themselves to Obi-Wan's starfighter they flew off. Wouldn't there need to be some sort of atmosphere for that to happen?
Or an electronic "Jump to Conclusions map"
Since it's supposed to be a RAW format can we call it "Raw Dung"?
They are launching a probe INTO the astroid? Are they crazy? jeez, what people will do for the name of science.
Doesn't the headline say they're using radar?
We barely avoided it last year: Cubs-Red Sox World Series
Funny, I thought they would name it Kronecker.