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

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

Since the power is determined as

We have there that

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.

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