Question

An alternating current generator has an internal resistance $R_g$ and an internal reactance $X_g$. It is used to supply power to a passive load consisting of a resistance $R_g$ and a reactance $X_L$. For maximum power to be delivered from the generator to the load, the value of $X_L$ is equal to

• A. zero
• B. $X_g$
• C. $-X_g$
• D. $R_g$

Answer 1

Answer: (C)

$-X_g$

Answer 2

For maximum power to be delivered from the generator to the load, the total reactance must vanish. i.e., $X_L + X_g = 0$ or $X_L = -X_g$.