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The form factor of an alternating quantity is given by

  • A.\(\frac{\text{average value}}{\text{rms value}}\)
  • B.\(\frac{\text{average value}}{\text{maximum value}}\)
  • C.\(\frac{\text{rms value}}{\text{average value}}\)
  • D.\(\frac{\text{rms value}}{\text{maximum value}}\)

Answer: C

The form factor is rms value / average value.

Form factor describes the shape of a waveform as the ratio of its rms value to its average (half-cycle mean) value. For a sine wave it is 0.707Vm / 0.637Vm = 1.11, which is why average-responding meters are scaled by 1.11 to read rms.

Maximum value divided by rms value is the peak (crest) factor, 1.414 for a sine wave. The ratios with average or rms value over maximum value, and average over rms, are not the form factor.

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