Q.

An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the ac is 28 V. The r.m.s. secondary voltage is nearest to

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a

50 V

b

70 V

c

100 V

d

40 V

answer is A.

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Detailed Solution

NsNp=VsVp⇒250100=Vs28/2⇒Vs=50 V
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An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the ac is 28 V. The r.m.s. secondary voltage is nearest to