Electrical Engineering ⇒ Topic : Instantaneous value

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 v and i respectively. As an example, the instantaneous values of voltage (See Fig. a) at  0°, 90°  and 270° are 0, + V^m',-V^m respectively.

                                                                              figure (a)