Question

For maximum power transfer in an AC circuit, the load impedance $Z_L$ should be:

• A. Equal to source impedance $Z_s$
• B. Complex conjugate of source impedance $Z_s$
• C. Equal to magnitude $|Z_s|$
• D. Complex conjugate of load impedance

Hint:

AC max power → Load = conjugate of source.

Answer 1

The Correct Option is B

Concept: Maximum power transfer theorem (AC): \[ Z_L = Z_s^* \]

Step 1: Meaning Load impedance must be complex conjugate of source impedance. \[ Z_s = R + jX \Rightarrow Z_L = R - jX \]

Step 2: Conclusion \[ \therefore \text{Correct answer is (B)} \]