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JAMB Physics 2012 Question 43

Question 43

Alternating Current Circuits

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

  1. A.5.0A
  2. B.7.1A
  3. C.10.0A
  4. D.14.1A
Show the answer and explanation

Answer: B (7.1A)

Explanation

The d.c. equivalent is the r.m.s. value: Irms = I0/√2 = 10 ÷ 1.414 ≈ 7.1 A.