In the RL circuit given below, the maximum power will be transferred when value of RL is [Figure description: A planar DC circuit. Left branch: a 5 V voltage source (vertical). Top wire: a 10 Ω resistor from the 5 V source to a first node, then another 10 Ω resistor to a second node. From the first node, a middle vertical branch goes down through a 10 Ω resistor in series with a 2 V voltage source to the bottom wire. At the second node, a 1 A current source (arrow pointing downward) is connected between top and bottom wires, in parallel with the load resistor RL at the far right.]
- A. 5 Ohms
- B. 15 Ohms
- C. 20 Ohms
- D. 25 Ohms
Answer: A. 5 Ohms
Explanation: For maximum power transfer to a purely resistive load RL connected to impedance Zs = R + jX, RL = |Zs| = √(4² + 3²) = 5 Ω.