A transformer is used to light a 100W and 110 V lamp from a 230 V mains If the main current is 05 A the efficiency of the transformer is

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Question:A transformer is used to light a 100W and 110 V lamp from a 230 V mains If the main current is 05 A the efficiency of the transformer is

1.50%

2.20%

3.87%

4.67%

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  1. A transformer is used to light a 100W and 110 V lamp from a 230 V mains If the main current is 05 A the efficiency of the transformer is
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