what minimum diameter can the wires have if the voltage drop along the opy of Se

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what minimum diameter can the wires have if the voltage drop along the

opy of Semester 2, Knight/Jones/Field 2e h 22 HW Problem 22.56 roblem 22.56 Part A When the starter motor on a car is engaged, there is a 330 A current in the wires between the battery and the motor Suppose the wires are made of copper and have a total length of 1.3 m What minimum diameter can the wires have if the voltage drop along the wires is to be less than 0.60 V? Express your answer using two significant figures. 0? Submit My Answers Give Up Provide

Explanation / Answer

The maximum resistance is 0.6V/330A = 1.818E-3 ohms

The resistivity of copper is 1.68E-8 OhmMeter,

thus

1.818E-3 ohms = (1.68E-8 OhmMeter)(1.3m) / (Pi r^2)

r = 0.00195 meters = 1.955 mm radius, 3.9 mm diameter

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