Household wiring often uses 2.0-mm-diameter copper wires. The wires can get rath

Question

Household wiring often uses 2.0-mm-diameter copper wires. The wires can get rather long as they snake through the walls from the fuse box to the farthest corners of your house.

Problem 30.66 Household wiring often uses 2.0-mm-diameter copper wires. The wires can get rather long as they snake through the walls from the fuse box to the farthest corners of your house. Part A What is the potential difference across a 18-m-long, 2.0-mm-diameter copper wire carrying an 7.3A current? Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

resistance R = rho L/A

R = 1.68 e-8 * 18/(3.14*1*1e-6)

R = 0.0963 ohms

so noe use ohms law as V = iR

so V = 7.3* 0.0963

V = 0.703 Volts

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