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Homework Statement
You are working for the power company and wonder why we use a set voltage of power lines instead of a set current. You test your system on 38 m of aluminium wire with a diameter of 10.0 cm. The resistivity of aluminium is 2.65e-8 Ohm*meters. You place a 9000 Volt potential difference across the wire.
a. What is the current through the wire?
b. What is the power lost from the wire?[/B]
Homework Equations
The Attempt at a Solution
a. First, i need to find the Resistance of the wire by using equation R = pL /A
p = 2.65 e-8, L = 38 m, A= pi * (.05 m) ^2
Then i find the Current by I = V / R. I plug in the number, and i keep get the wrong answer.
For the power lost: Can i use the equation P = I * V ?[/B]