Starter Motor

Posted in Boat Motors by admin on March 21, 2011

The starter motor of a car engine draws a current of 130 A from the battery. The copper wire to the motor is?

The starter motor of a car engine draws a current of 130 A from the battery. The copper wire to the motor is 5.0mm in diameter and 1.1m long. The starter motor runs for .70 s until the car engine starts.
How much charge passes through the starter motor?

The charge passing through the starter motor = current*time = 130*0.70 = 91 coulomb. The other data is superfluous for this conclusion. Here we have assumed that the current passing through the stater coil was constant at 130 A for all 0.70 s In actual practice it will not be so. Then we have to know how current grows and integrate the product i*dt for zero to 0.70 s.

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