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What is the expression forthe thevenin’s current if there is an external resistance in series with the RTh?

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What is the expression forthe thevenin’s current if there is an external resistance in series with the RTh?

(a) VTh/ITh

(b) VTh/ (RTh-R)

(c) VTh/ (RTh+R)

(d) VTh/RTh

I have been asked this question in an internship interview.

This question is from Thevenin and Norton Equivalents,  More on Deriving a Thevenin Equivalent in portion Techniques of Circuit Analysis of Electric Circuits

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Correct answer is (c) VTh/ (RTh+R)

Explanation: ITh= VTh/ (RTh+R).

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