what is the internal resistance of a 12v car battery whose terminal voltage drops to 8.4v when the starter draws 95 A? What is the resistance of the starter?
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Given - EMF of battery - 12 Volts
Voltage - 8.4 Volts
Current drawn - 95 Ampere.
Find - Internal resistance of battery of car and resistance of starter.
Solution - The internal resistance of battery can be calculated by the formula - E = V + Ir. In the formula, E represents EMF, V represents voltage, I represents current and r represents internal resistance.
Keeping the values in equation-
r = (E - V)/I
r = (12-8.4)/95
r = 0.038 ohms
Further, resistance of starter will be calculated as - R = V/I
R = 8.4/95
R = 0.09 ohms.
Thus, internal resistance and resistance are 0.038 ohms and 0.09 ohms respectively.
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