Power loss?? (1 Viewer)

[polyspaston]

We understand that our electricty is generated as AC and then stepped up during transmission in order to minimise power loss. Power loss is given by: P = I²R.
According to V = IR, if we increase the voltage, current must also increase as resistance is constant, so wouldn't this mean that power loss also increases? Could the resoning beind the need to step-up voltage be due to the fact that the wires are non-ohmic and therefore do not obey V = IR. But this could not possibly be true since P = I²R was derived from V = IR.

 

[denoz]

Look at it in terms of P=VI and it should work out fine (assuming power is constant).

 

[zingerburger]

Mmm, exactly. My friend had this crazy argument with the teacher that was along the lines of the original poster's logic. But my friend argues for the sake of it...

But if you look at the equation P=IV, if I increases then V must decrease.