OF
Well-Known Member
If the fabric gets torn, there's that much less electrical resistance = less heat
No, that's not how electricity works. Broken strands mean less current paths, less total current for the same voltage is higher resistance. A fairly minor effect for a few strands of many.
Less resistance is more current and therefore power. Resistance means the same in Electricity as English, more resistance means less activity not the other way around. Short circuits (maximum power) are zero ohms (lowest possible resistance).
In practice, however, small tears are trivial. Yes, you loose the path right there, but the strands going the other way bridge the gap by shunting current to either side of the tears. Total current drops a very small amount, but 'down in the trench', where it counts, all strands are carrying current, all heat very close to normally.
Large tears make the average path longer (raising total resistance, lowering current and therefore power), eventually long enough to matter. The only real problem with tears is mechanical when they are small.
OF