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Post-UTME Physics 2019 Objective — Question 4

Question 4 of 20 from the Post-UTME Screening (Post-UTME) Physics 2019 Objective paper, with the correct answer and a full explanation.

A small heater has a rating of 24W at 12V d.c. The resistance of the heater is

A. 24.0 ohm
B. 6.0 ohmCorrect
C. 2.0 ohm
D. 0.5 ohm

Explanation

R = V^2/P = 12^2/24 = 144/24 = 6.0 ohm.

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