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JAMB Physics 1995 Question 40

Question 40

Current Electricity

A 12 V battery has an internal resistance of 0.5 Ω. If a cable of 1.0 Ω resistance is connected across the two terminals of the battery, the current drawn from the battery is

  1. A.16.0 A
  2. B.8.0 A
  3. C.0.8 A
  4. D.0.4 A
Show the answer and explanation

Answer: B (8.0 A)

Explanation

I = E/(R + r) = 12 ÷ (1.0 + 0.5) = 8.0 A.