Question

A battery with 12-V emf has a terminal voltage of 11.4 V when it delivers 20A to a starter of a car. What is the internal resistance of the battery?

Answer 1

Explanation:

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Answer 2

Answer:

e = electromotive force

r = Internal resistance of battery

v = potential difference (terminal) across the cell when the current (I) is flowing through the circuit.

R =Load resistance

I =Current

(e - v)/I = r

(12-11.4)/20 = 0.3 Ohm