Question

The expression of equivalent impedance (ZN) in the circuit shown below is?

(a) (Z1+Z2)/Z1

(b) (Z1+Z2)/Z2

(c) Z1Z2/(Z1+Z2)

(d) Z1+Z2

This question was posed to me in semester exam.

My query is from Norton’s Theorem topic in division Steady State AC Analysis of Network Theory

Answer 1

Correct option is (c) Z1Z2/(Z1+Z2)

The best explanation: The impedance between the points a and b with the source replaced by a short circuit is Norton’s equivalent impedance. The Norton’s equivalent impedance is ZN = Z1Z2/(Z1+Z2).