# Power Loss

1. May 14, 2006

### gubretaw

I have an assignment that requires me to discuss why do we step up voltage when transmitting power over long distance.

I was told that in having a high voltage you have a low current, which then reduces the power loss. What I do not understand is how does low current relates to the reduction in power loss?

2. May 14, 2006

### Hootenanny

Staff Emeritus
The resistance of a conductor converts electric energy into heat energy (via the collisions of the electrons with the metal lattice). If we use $P = IV$ and $V = IR$ we can show that the power dissapated by the resistance is given $P = I^{2}R$. Therefore, lowering the current, reduces the power loss.

~H

3. May 15, 2006