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The household suply of electricity is at...

The household suply of electricity is at `220 V` (rms value) and `50 Hz`. Find the peak voltage and the least possible time in which the voltage an change from the rms value to zero.

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The correct Answer is:
`220sqrt2 V, 2.5 ms`
`V_(@)=sqrt2 V_(rms)=200sqrt2 rArrDeltaV=V_(@)/sqrt2 rArrV_(@)/sqrt2=V_(@) sin omegatrArr2pifxxt=pi/4 t=2.5 ms`
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