A transformer is used to light 140 Watt, 24 volt lamp from 240 volts A.C. mains. If the current in the mains is 0.7 A, then the efficiency of transformer is

Options :
  1. 63.8 %
  2. 84%
  3. 83.3 %
  4. 48 %
Answer and Explanation :-

Answer: Option 3

Explanation:

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