WAEC Physics 2017 Objective — Question 37

Question 37 of 50 from the West African Examinations Council (WAEC) Physics 2017 Objective paper, with the correct answer and a full explanation.

[Same circuit as above] Determine the potential difference, V, across the parallel resistors.

A. A. 2.0 V
B. B. 2.3 VCorrect
C. C. 3.0V
D. D. 9.7V

Explanation

The total potential = (Potential across the parallel conductor) + (Potential across the 10Ω resistor). Potential across the 10Ω resistor V=IR=0.97x10=9.7V. Therefore, the potential across the parallel resistors (12-9.7)V = 2.3V, or equivalently V46=IxR46=0.97x2.4=2.3V.

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