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

[" 30.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 approximately "],[[" (1) "30%," (2) "50%," (3) "90%," (4) "10%]]

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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 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 220 V (Mains). If the main current is 0.5 A, the efficiency of the transformer is approximately