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[" A transformer is used to light a "100...

[" A transformer is used to light a "100W" and "110V],[" lamp from a "220V" mains.If the main current is "],[0.5A" ,the efficiency of the transformer is "]

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