A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main…
Physics · NEET · NTA Exams — Electromagnetic Induction and Alternating Currents
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%
Answer
(C) 90%
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