Question

In the circuit given below, a dc circuit fed by a current source. With respect to terminals AB, Thevenin’s voltage and Thevenin’s resistance are ____________

(a) VTH = 5 V, RTH = 0.75 Ω

(b) VTH = 7.14 V, RTH = 2.14 Ω

(c) VTH = 7.5 V, RTH = 2.5 Ω

(d) VTH = 5 V, RTH = 1 Ω

This question was posed to me in examination.

My question is taken from Advanced Problems on Filters topic in section Filters and Attenuators of Network Theory

Answer 1

Correct answer is (b) VTH = 7.14 V, RTH = 2.14 Ω

The best explanation: VTH = \(\frac{5 X 10}{35}\)  X 5 = 7.14 V

Also, RTH = \(\frac{5 X 15}{35}\) = 2.14 Ω.