# Quick question about power lines and E=IxR

1. May 17, 2012

### Lavid2002

Ok so I have read that power lines carry very high voltage to minimize loss through resistance, but when I take a look at the formula

E=IxR
E=Voltage
I=Current
R=Resistance

Divide both sides to get

E/I=R

To minimize R we should make the numerator of the quotient smaller, and the denominator larger (I.E. 1/1,000,000) To get a small value for R right?

This would in turn, mean cranking up the current, and lowering the voltage

I know I am wrong, as the companies get good results from cranking up the voltage. I can't find my error though.

Thanks Guys :D

-Dave

2. May 17, 2012

### Bob S

The power loss is actually I2R, so minimizing current minimizes losses.

3. May 18, 2012

### Curl

R is fixed, a material property of the aluminum/iron that the wires are made of. You are minimizing power loss as Bob S said.