Question

As more resistors are added in series across a constant voltage source, the power supplied by the source: A) does not change. B) increases. C) decreases. D) is always zero

Answer 1

As series resistors are added, the resistance is added directly so the total resistance will be equal to

`R_T = R_1+R_2+R_3... R_(\infty)`

Since the power is determined as

`P = (V^2)/(R)`

We have there that

`P \propto (1)/(R)`

The power is inversely proportional to the increase in resistance, so it will tend to decrease as more resistors are added in series.

The correct answer is: C.