A transformer is used to light a `100 W` and `110 V` lamp from a `220V` mains. If the main current is `0.5 A`, the Efficiency of the transformer is approximately:A. `10%`B. `30%`C. `50%`D. `90%`

A transformer is used to light a `100 W` and `110 V` lamp from a `220V

1.	A transformer is used to light a `100 W` and `110 V` lamp from a `220V` mains. If the main current is `0.5 A`, the Efficiency of the transformer is approximately:A. `10%`B. `30%`C. `50%`D. `90%`
Answer» Correct Answer - D The efficiency of transformer `eta=(V_(S)I_(S))/(V_(P)I_(P))xx10=(100)/(220xx0.5) xx 100~~90%`

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A transformer is used to light a `100 W` and `110 V` lamp from a `220V` mains. If the main current is `0.5 A`, the Efficiency of the transformer is approximately:A. `10%`B. `30%`C. `50%`D. `90%`

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