Question

Consider the circuit shown below. Find the current through 4Ω resistor.

(a) 2

(b) 1.5

(c) 1

(d) 0.5

I had been asked this question in an interview for internship.

Query is from Millman’s Theorem topic in division Useful Theorems in Circuit Analysis of Network Theory

Answer 1

Correct option is (b) 1.5

For explanation: Applying Nodal analysis the voltage V is given by (5-V)/1+(10-V)/3=V/4. V=6V. The current through 4Ω resistor I = V/4 = 6/4 = 1.5A.