Originally Posted by Dave_Monica
I don't fully understand why the voltage drops as the load increases, but that's what I've seen plugged in at home or at the campground. Dave
The formula for power (Watts) is W = IV where Watts is the product of current draw and volts supplied.
The appliance requires a fixed amount of power (watts) to operate. Say 1200W
If voltage drops due to high current demand, the amount of amps required to so (1200 watts of work) goes up. It will do this until the breakers blow or the motor fries.
That is on the "consumption" side of the campground wire problem.
On the supply side:
The supply wire has a certain resistance per foot of run. This resistance is NOT FIXED. It is a variable dependent on temperature. The higher the temperature, the higher the resistance to electron flow and the more voltage is lost on the line in the form of heat.
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Increase the current and the resistance at the same time (load) and you increase voltage drop. Materials can fix this problem. Cheap wiring in older campgrounds used aluminum wire. Switching to copper will half line voltage loss.
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