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As additional resistors are connected in series to a constant voltage source, how is the power supplied by the source affected?

(A) The power supplied by the sources remains constant.
(B) The power supplied by the source increases.
(C) The effect on the power supplied by the source cannot be determined without knowing the voltage of the source.
(D) The power supplied by the source decreases.

Respuesta :

Answer:

(D) The power supplied by the source decreases.

Explanation:

If additional resistors are connected in series, then the total resistance of the circuit is increased. By the Ohm’s Law, V = iR, the current decreases.

The power supplied by the source is P = i*i*R = i*(i*R). The term in the parenthesis is the voltage of the circuit and is constant. The ‘i’ outside decreases, therefore the power supplied by the source decreases.

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