Question

Find the current flowing between terminals A and B of the circuit shown below.

(a) 1

(b) 2

(c) 3

(d) 4

I had been asked this question at a job interview.

This interesting question is from Norton’s Theorem topic in portion Useful Theorems in Circuit Analysis of Network Theory

Answer 1

Right answer is (d) 4

For explanation: The magnitude of the current in Norton’s equivalent circuit is equal to the current passing through the short circuited terminals that are I=20/5=4A.