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A transformer is used to light a 100 W a...

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:

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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 A. The efficiency of the transformer is :

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