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JAMB Physics 2003 Question 45

Question 45

Alternating Current Circuits

When an alternating current given by I = 10sin(120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

  1. A.1200W
  2. B.600W
  3. C.120W
  4. D.30W
Show the answer and explanation

Answer: B (600W)

Explanation

Irms = 10/√2 A, so P = Irms2R = 50 × 12 = 600 W.