Question

The efficiency of a transformer is the ratio of output power to input power.

(a) True

(b) False

I got this question in an interview for internship.

The query is from Alternating Current topic in division Alternating Current of Physics – Class 12

Answer 1

Correct answer is (a) True

Explanation: Yes, the efficiency of a transformer can be determined by taking the ratio of output power to input power. Transformers are the most highly efficient electrical devices. Most of the transformers have full load efficiency between 95% and 98.5%.

Efficiency (η)=\(\frac {Output \, power}{Input \, power}=\frac {V_s I_s}{V_p I_p}\)