-Given the circuit in Figure , what load value should be used to replace R2 to obtain the maximum power transfer to the load? Determine the type of load, and express the value in rectangular form.
A) 168 Ω - j76.8 Ω
B) 88.1 Ω - j39.4 Ω
C) 168 Ω + j76.8 Ω
D) 64.1 Ω- j73.6 Ω

Question

-Given the circuit in Figure , what load value should be used to replace R2 to obtain the maximum power transfer to the load? Determine the type of load, and express the value in rectangular form.
A) 168 Ω - j76.8 Ω 
B) 88.1 Ω - j39.4 Ω 
C) 168 Ω + j76.8 Ω 
D) 64.1 Ω- j73.6 Ω

Quizplus · Accepted Answer

For maximum power transfer to a load in an AC circuit, the load impedance must be the complex conjugate of the source impedance. If the source has an impedance of $Z_{source} = R + jX$, then the load impedance for maximum power transfer should be $Z_{load} = R - jX$ or vice versa. Choice C, $168 \Omega + j76.8 \Omega$, is the complex conjugate of a source impedance that would have been $168 \Omega - j76.8 \Omega$, making it the correct choice for maximum power transfer.

-Given the Circuit in Figure , What Load Value Should