The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?
Correct answer: C. 45
- A. 90
- B. 60
- C. 45
- D. 30
Explanation
For a sine wave, the instantaneous value equals the RMS value when sin θ = 1/√2. This occurs at 45° in the first quarter-cycle, since RMS current is Imax/√2.
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