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What will be the instantaneous voltage f...

What will be the instantaneous voltage for a.c. supply of 220 V at 50 hertz ?

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`E = ? E_(v) = 200 V, v = 50 hertz, E_(0) sqrt 2 E_(v) = 1.44 xx 220 = 311` volt
The instantaneous value of alternating e.m.f. is `E = E_(0) sin omega t = E_(0) sin 2 pi vt = 311 sin 2 pi xx 50 t`
`E = 311 sin 100 pi t`
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