Question

In a delta connected system, the expression of power (P) is?

(a) VLILcosφ W

(b) √3 VLILcosφ W

(c) 3VLILcosφ W

(d) 3√3VLILcosφ W

The question was posed to me at a job interview.

My question is taken from Voltage, Current and Power in a Delta Connected System in portion Polyphase Circuits of Network Theory

Answer 1

Right answer is (b) √3 VLILcosφ W

The explanation is: The total power in the delta circuit is the sum of the powers in the three phases. In a delta connected system, the expression of power (P) is P = √3VLILcosφ W.