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The power dissipated in an a.c. circuit with an r.m.s, current of 5A, r.m.s voltage...

Physics
JAMB 1997
The power dissipated in an a.c. circuit with an r.m.s, current of 5A, r.m.s voltage of 10V and a phase angle of 60o is
  • A. 25W
  • B. 50W
  • C. 120W
  • D. 125W
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Correct Answer: Option A
Explanation
P = IVcos\(\theta\)

= 5 x 10 x cos60

= 25W
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