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JAMB Physics 2001 Question 40

Question 40

Alternating Current Circuits

The current through a resistor in an a.c. circuit is given as 2 sin ωt. Determine the d.c. equivalent of the current.

  1. A.1/√2 A
  2. B.2√2 A
  3. C.2 A
  4. D.√2 A
Show the answer and explanation

Answer: D (√2 A)

Explanation

The d.c. equivalent is the r.m.s. value: Irms = I0/√2 = 2/√2 = √2 A.