Page 288 - Basic Electrical Engineering

Thus, the RMS value of a full sine wave is and for a half wave,

Average value of current for half sine wave is

Note that for a complete sine wave, the average value was calculated as

and for a half-rectified sine wave, the average value has been calculated as

Obviously, we note that for a half-rectified wave, the average value is half of
that of a full sine wave.

Form factor for a half sine wave quantity is

3.1.8 Concept of Phase and Phase Difference

The position of a coil or a set of coils forming a winding with respect to some
axis of reference is called its phase. If three coils are placed at different