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A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is...

Physics
JAMB 1995
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 Answer: Option B
Explanation
I = \(\frac{E.m.f}{R + r}\)

= \(\frac{12}{1 + 0.5}\)

I = 8A
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