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Q.

A transformer is used for a 100 watt, 20 volt electric bulb at a place where the A.C. mains potential is 200 volt and the current drawn is 0.6 A. The efficiency of the transformer is nearly :

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a

48%

b

68%

c

30%

d

83%

answer is D.

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Detailed Solution

Percentage efficiency = VsIsVpIp x 100=100200 x 0.6 x 100=83%
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