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Asked in FBISE Physics 2023 — Model Paper 2023

The peak value of A.C source is 20 A, its rms value will be:

Correct answer: A. 14.1 A

  • A. 14.1 A
  • B. 10 A
  • C. 20 A
  • D. 28.2 A

Explanation

The root mean square (rms) value of an alternating current (AC) can be calculated from its peak value using the following formula: Irms = Ipeak /√2where:(Irms) is the rms value of the current,(Ipeak) is the peak value of the current.Given that the peak value (Ipeak) is 20 A, we can substitute this into the formula to find the rms value: Irms = Ipeak /√2 = 20A/√2 =14.1ASo, the rms value of the AC source is approximately 14.1A.

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About Phase of Alternating Current

Phase describes the position of an alternating voltage or current within its cycle and the phase difference between two sinusoidal quantities. The topic covers in phase signals, phase angle and lead or lag in resistive, inductive and capacitive circuits, rather than the amplitude or frequency of the supply.

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