The energy used by an appliance which operates at 240 volts at 15 amp for 4 hr. is a. 0.92 kwhr. b. 3.45 kwhr. c. 14.4 kwhr. d. 60.0 kwhr

C. 14.4 kwhr.

Explanation:

To calculate the energy used by appliance first calculate the power. The formulae for calculating power(P) is , where V stands for voltage and I stands for current.

In the given problem,  V = 240 volts and I = 15 amp. Therefore,

Now, formulae for calculating energy used i.e. work(W) is , where t is the time.

In the given question time is 4 hr. Therefore energy used will be,

Energy used (W) = .