Q.

A transformer is used to light a 100 w and 110 V lamp from a 220 V mains. If the main current is 0. 5 amp, the efficiency of the transformer is approximately

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a

10%

b

30%

c

50%

d

90%

answer is D.

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Detailed Solution

P0=100W, Pi=220×0.5η=P0Pi×100=100×100220×0.5≈90%
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