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Maximum power in terms of the thevenin’s voltage and load resistance __________

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Maximum power in terms of the thevenin’s voltage and load resistance __________

(a) (VTh) 2 /4RL

(b) (VTh) 2 *4RL

(c) (VTh) 2 +4RL

(d) 4RL/ (VTh) 2

The question was asked in exam.

This is a very interesting question from Maximum Power Transfer and Superposition in section Techniques of Circuit Analysis of Electric Circuits

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Best answer
Right choice is (a) (VTh) 2 /4RL

For explanation: Pmax= v*i= i*R*i= i2RL = (VTh/(RTh+RL))2*RL.    Max power occurs when RL=RTh.

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