As more resistors are added in series to a constant voltage

As more resistors are added in series to a constant voltage source, the power supplied by the source A) increases for a time and then starts to decrease. B) decreases. C) does not change. D) increases.

Solution

As resistors are added in series then

Req = R1 + R2 + R3 + R4 + .............

Power = V^2 / Req

V is constant.

as more resistance are added then Req increase.

so power decreases

Ans(B)