Question

In the circuit shown below. Determine the power dissipated in 3Ω resistor.

(a) 7.77

(b) 8.77

(c) 9.77

(d) 10.77

The question was asked by my school principal while I was bunking the class.

The question is from Nodal Analysis topic in division Steady State AC Analysis of Network Theory

Answer 1

Correct choice is (b) 8.77

Best explanation: Current in 3Ω resistor I3 =  (-20∠30^o+16.27∠18.91^o)/3=1.71∠-112^o. Power dissipated in 3Ω resistor P=I3^2 R=1.71^2×3=8.77W.