A transformer is used to light a 100 W, 110 V lamp from 220 V mains. If the mains current is 0.5 A, the efficiency of the transformer is: - DASH

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Question

A transformer is used to light a 100 W, 110 V lamp from 220 V mains. If the mains current is 0.5 A, the efficiency of the transformer is:

90%

95%

96%

99%

Solution

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