Question

Identify the correct formula of electric power.

(a) Electric power = \(\frac {time \, taken}{electric \, work \, done}\)

(b) Electric power = \(\frac {electric \, work \, done}{time \, taken}\)

(c) Electric power = electric work done × time taken

(d) Electric power = \(\frac {1}{electric \, work \, done}\)

The question was posed to me in an interview for job.

Enquiry is from Current Electricity topic in portion Current Electricity of Physics – Class 12

Answer 1

The correct choice is (b) Electric power = \(\frac {electric \, work \, done}{time \, taken}\)

To explain I would say: Electric power is defined as the rate at which work is done by the source of emf in maintaining the current in the electric circuit. So, the formula of electric power is:

Electric power (P) = \(\frac {electric \, work \, done}{time \, taken}\)