An automobile starter motor has an equivalent resistance of 0.0660 ? and is supp

Question

An automobile starter motor has an equivalent resistance of 0.0660 ? and is supplied by a 12.0-V battery with a 0.0170-? internal resistance.

(a) What is the current to the motor?
  A

(b) What voltage is applied to it?
  V

(c) What power is supplied to the motor?
  kW

(d) Repeat these calculations for when the battery connections are corroded and add 0.0900 ? to the circuit. (Significant problems are caused by even small amounts of unwanted resistance in low-voltage, high-current applications.)

Explanation / Answer

a) i = V/R = 12 / (0.066 + 0.017) = 144,58 A

b) Vmototr = i * Rmotor = 9.54 V

c) P = i^2 R = 1380 Watts = 1.38 KW

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