2 ms·
Who says R is the same in the new cable ? Additionally, your demonstration is incorrect, with the same argument you can also write P = I×V = V²/R and conclude
by Rexxar 5y ago
Who says R is the same in the new cable ?
Additionally, your demonstration is incorrect, with the same argument you can also write P = I×V = V²/R and conclude that you don't want to increase voltage.
- nitrogen 5y agoThe V in that equation is for voltage drop along the cable, though, not total system voltage relative to ground. And that voltage drop is proportional to total system current, but not total system voltage.
- kens 5y agoYou're mixing up the supply voltage and the voltage drop in the wire. Increasing the supply voltage will decrease the voltage drop in the wire (assuming appropriate adjustments to the load). It's the same reason you're better off using an AC extension cord for your phone charger than using a long USB cable.