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JAMB Physics 2013 Objective — Question 38

Question 38 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2013 Objective paper, with the correct answer and a full explanation.

A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell.

A. 4.0ΩCorrect
B. 3.0Ω
C. 1.5Ω
D. 1.0Ω

Explanation

I = ε/(R+r); 0.3 = 1.5/(1+r); 1+r = 1.5/0.3 = 5; r = 5-1 = 4Ω.

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