Question

What will be the value of i1 in the following circuit?

(a) 0.6 A

(b) 2.1 A

(c) 1.3 A

(d) 1.7 A

I have been asked this question during a job interview.

My question is from Method of Analysis in section EDC Overview of Electronic Devices & Circuits

Answer 1

The correct choice is (c) 1.3 A

To explain I would say: By nodal analysis computing v1 and v2 where

(V1-75)/8 + V1/4 + (V1-V2)/2=0      — (1)

(V1-V2)/2 + [V1-(10*6)]*/(10+5) + V2/3=0    — (2)

*converting current source to voltage source (source transformation)

Hence, i1 = (v1-v2)/2 which gives i1 = 1.3A.