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 amp, the efficiency of the transformer is approximately - VgyanHub

Question:

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 amp, the efficiency of the transformer is approximately

Options :

(a) 30%
(b) 50%
(c) 90%
(d) 10%

Answer :

(c) 90%

Answer Steps :

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