Question

If the load impedance is Z∠Ø, the current (IR) is?

(a) (V/Z)∠-Ø

(b) (V/Z)∠Ø

(c) (V/Z)∠90-Ø

(d) (V/Z)∠-90+Ø

The question was asked in class test.

This interesting question is from Three-Phase Balanced Circuits in portion Polyphase Circuits of Network Theory

Answer 1

The correct option is (a) (V/Z)∠-Ø

Best explanation: As the load impedance is Z∠Ø, the current flows in the three load impedances and the current flowing in the R impedance is IR = VBR∠0⁰/Z∠Ø = (V/Z)∠-Ø.