Instantaneous voltage or current in tamil

AC Waveform:
The shape obtained by plotting the instantaneous ordinate values of either voltage or current against time is called an AC Waveform.

An AC waveform is constantly changing its polarity every half cycle and alternating between a positive maximum value and a negative maximum value respectively with respect to time. The sinusoidal waveform or sine wave is the fundamental type of alternating current and alternating voltage.

It is also referred to as a sinusoidal wave or simply sinu soid. The electrical service provided by the power company (Electricity Board) is in the form of sinusoidal voltage or current.

Instantaneous value:
The value of an alternating quantity at any instant is called instantaneous value.

They are represented by small letters, i, v, e etc.,

Expression for instantaneous value of current: i=Im sin θ
i=Im sin ωt
i=Im sin 2πft

Expression for instantaneous value of voltage: v=Vm sin θ
v=Vm sin ωt
v=Vm sin 2πft

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