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JAMB Physics 2009 Question 40

Question 40

Current Electricity

Calculate the e.m.f. of the cell in the above circuit if its internal resistance is negligible.

Diagram for this question
  1. A.12V.
  2. B.8V.
  3. C.2V.
  4. D.36V.
Show the answer and explanation

Answer: B (8V.)

Explanation

3 Ω and 6 Ω in parallel give (3 × 6)/(3 + 6) = 2 Ω. With 4.0 A flowing, E = IR = 4 × 2 = 8 V.