A 12V battery has an internal resistance of 0 5... - JAMB Physics 1995 Question
A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is
A
16.0A
B
8.0A
C
0.8A
D
0.4A
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Correct Option: B
I = (\frac{E.m.f}{R + r})
= (\frac{12}{1 + 0.5})
I = 8A
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