A load resistor RL is connected to a battery of voltage E with internal resistance Ri through a resistance RS as shown in the figure. For fixed values of RL and Ri, the value of RS (≥ 0) for maximum power transfer to RL is

A load resistor RL is connected to a battery of voltage E with interna

1.	A load resistor RL is connected to a battery of voltage E with internal resistance Ri through a resistance RS as shown in the figure. For fixed values of RL and Ri, the value of RS (≥ 0) for maximum power transfer to RL is
A.	0
B.	RL - Ri
C.	RL
D.	RL + Ri
Answer» B. RL - Ri