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"The article indicates that a 100 foot cord connected to a standard outlet does not provide enough power to prevent a Tesla car from discharging..." Pretty sur
by Steko 15y ago
"The article indicates that a 100 foot cord connected to a standard outlet does not provide enough power to prevent a Tesla car from discharging..."
Pretty sure they say that to make sure people don't just use any old cord. A 24 AWG cord with 66% voltage drop as the low end would change your cost analysis radically.
- ChuckMcM 15y agoYou probably meant 4 AWG, a 100' of 24 AWG cord has about 2.5 ohms of resistance in it. Since power dissipation is exponential with current pulling even 2 amps through it would have the wire trying to dissipate 10 watts and that would represent 100mW/foot, easily enough to raise the temperature of the copper to the point where it would be too soft and break. [1] http://www.cirris.com/testing/resistance/wire.html http://www.cirris.com/testing/resistance/wire.html
- nitrogen 15y agoSince power dissipation is exponential with current Minor nitpick: power is proportional to the square of current (e.g. P=I^2), not exponentially proportional (which would be something like P=e^I).
- Steko 15y agoI was just following an online calculator, will plead ignorance on the physics but I think the basic point holds for some gauge wire.
- Steko 15y agoI was just following an online calculator, will plead ignorance on the physics but I think the basic point holds for some gauge wire.