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Q.

The equation of the alternating voltage applied to our houses is  e=(311sin100πt) volt. A hot wire instrument is used to measure the alternating voltage. The rms value of emf is

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a

219.9V

b

329.1V

c

543.7V

d

432.7V

answer is A.

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Detailed Solution

Given ε0=311V

εrms=ε02=3112×22

         =3112×1.414

         =155.5×1.414

         =219.877

         =219.9V

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