Identify the value of an alternating voltage which is NOT given by the coefficient of the sine of the time angle?

Option 4 : Form value

Terminology in AC Waveform:

• An alternating voltage or current changes continuously in magnitude and alternates in direction at regular intervals of time.
• It rises from zero to maximum positive value, falls to zero, increases to a maximum in the reverse direction, and falls back to zero again shown.
• From this point on indefinitely, the voltage or current repeats the procedure.

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The important AC Waveform terminology is defined below:

1. Waveform: The shape of the curve is obtained by plotting the instantaneous values of voltage or current as ordinate against time as abscissa is called its waveform or waveshape.
2. Instantaneous value: The value of an alternating quantity at any instant is called instantaneous value. The instantaneous values of alternating voltage and current are represented by
3. v and i respectively.
4. Cycle: One complete set of positive and negative values of an alternating quantity is known as a cycle.
5. One cycle corresponds to 360º electrical or 2π radians.
6. Alternation: One-half cycle of an alternating quantity is called an alternation. An alternation spans 180º electrical.
7. Time period or Period: The time taken in seconds to complete one cycle of an alternating quantity is called its time period. It is generally represented by T.
8. Frequency: The number of cycles that occur in one second is called the frequency (f) of the alternating quantity. It is measured in cycles/sec (C/s) or Hertz (Hz).
9. Amplitude: The maximum value (positive or negative) attained by an alternating quantity is called its amplitude or peak value.
    

• Note: Form factor is the ratio of two different values of the waveform. It can calculate all kinds of waveforms.