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JAMB Physics 1981 Question 14

Question 14

Current Electricity

A cell of e.m.f. 2 V and internal resistance 1 Ω supplies a current of 0.5 amps to a resistance whose value is

  1. A.0.5 Ω
  2. B.1 Ω
  3. C.2 Ω
  4. D.2.5 Ω
  5. E.3 Ω
Show the answer and explanation

Answer: E (3 Ω)

Explanation

I = E/(R + r): 0.5 = 2/(R + 1), so R + 1 = 4 and R = 3 Ω.