WAEC Physics 2015 Objective — Question 41

Question 41 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.

A battery of e.m.f. 24 V is connected to three resistors P, Q and R as illustrated in the diagram above. Determine the voltage across the resistor Q.

• A. 5 V
• B. 10 VCorrect
• C. 14 V
• D. 24 V

Explanation

P and Q are in parallel, so they share the same voltage. Since 14 V is dropped across R, the remaining voltage across P (and Q) is 24 − 14 = 10 V.

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