The performance of the starter circuit in a car can be significantly degraded by a small amount of corrosion on a battery terminal. Figure 19-91a depicts a properly functioning circuit with a battery (12.5-V emf, 0.02-Ω internal resistance) attached via corrosion-free cables to a starter motor of resistance RS = 0.15 Ω. Sometime later, corrosion between a battery terminal and a starter cable introduces an extra series resistance of only RC = 0.10 Ω into the circuit as suggested in Fig. 19-91b. Let P0 be the power delivered to the starter in the circuit free of corrosion, and let P be the power delivered to the circuit with corrosion. Determine the ratio P/P0.
(a)

(b)

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8= 12.5 V r= 0.02 2 Rs = 0.15 Q Rc=0.10 2 8= 12.5 V r= 0.02 2 Rs =0.15 2