Question

The starter motor of a car engine draws an electric current of 20.0 A from the battery. The copper wire to the motor is 5.90 mm in diameter and 1.57 m long. The starter motor runs for 0.65 s before the car engine starts up. How much electric charge passes through the starter motor

Answer 1

Answer:

q = 13 C

Explanation:

Given that,

Electric current, I = 20 A

The starter motor runs for 0.65 s before the car engine starts up.

We need to find how much of electric charge passes through the starter motor. Let it is q.

Electric current = electric charge/time

$I=\dfrac{q}{t}\\\\q=It\\\\q=20\ A\times 0.65\ s\\\\q=13\ C$

So, 13 C of electric charge passes through the starter motor.