Question

While computing the Thevenin equivalent resistance and the Thevenin equivalent voltage, which of the following steps are undertaken?

(a) Both the dependent and independent voltage sources are short-circuited and both the dependent and independent current sources are open-circuited

(b) Both the dependent and independent voltage sources are open-circuited and both the dependent and independent current sources are short-circuited

(c) The dependent voltage source is short-circuited keeping the independent voltage source untouched and the dependent current source is open-circuited keeping the independent current source untouched

(d) The dependent voltage source is open-circuited keeping the independent voltage source untouched and the dependent current source is short-circuited keeping the independent current source untouched

The question was asked in final exam.

The doubt is from Thevenin Theorem Involving Dependent and Independent Sources in portion Useful Theorems in Circuit Analysis of Network Theory

Answer 1

Correct option is (c) The dependent voltage source is short-circuited keeping the independent voltage source untouched and the dependent current source is open-circuited keeping the independent current source untouched

To explain I would say: While computing the Thevenin equivalent voltage consisting of both dependent and independent sources, we first find the equivalent voltage called the Thevenin voltage by opening the two terminals. Then while computing the Thevenin equivalent resistance, we short-circuit the dependent voltage sources keeping the independent voltage sources untouched and open-circuiting the dependent current sources keeping the independent current sources untouched.