JAMB Physics 2012 Objective — Question 43

Question 43 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2012 Objective paper, with the correct answer and a full explanation.

The current output form of an a.c source is given as I=10 sin ωt. The d.c equivalent of the current is

A. 5.0A
B. 7.1ACorrect
C. 10.0A
D. 14.1A

Explanation

The d.c. equivalent (rms value) of an a.c. current I=I₀sinωt is Irms = I₀/√2 = 10/1.414 ≈ 7.1A.

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