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 approximately:

30 %

50 %

90 %

10 %

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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 approximately:

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Question Text

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 approximately:

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