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In the circuit shown below, find the value of load impedance for which source delivers maximum power.

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In the circuit shown below, find the value of load impedance for which source delivers maximum power.

(a) 15-j20

(b) 15+j20

(c) 20-j15

(d) 20+j15

The question was posed to me during a job interview.

The query is from Maximum Power Transfer Theorem in chapter Useful Theorems in Circuit Analysis of Network Theory

1 Answer

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The correct choice is (a) 15-j20

To explain: The maximum power transfer occurs when the load impedance is equal to the complex conjugate of source impedance ZS. ZL = ZS^* = (15-j20)Ω.

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