Question

one disadvantage of this type of circuit is that
a the addition of new light bulbs decreases resistance.
b as more lights are added to the circuit, the voltage to each decreases.
c as more lights are added to the circuit, the current to each increases.
d when the current to one light is turned on, the current to the other lights turns off.

Explanation:

This refers to a series circuit. In series circuits, components share the total voltage from the source. As more resistive components (like light bulbs) are added, the total resistance increases, and the voltage across each individual component decreases, which is a key disadvantage. Option A is incorrect because adding bulbs increases total resistance. Option C is wrong because total current decreases, so current to each bulb decreases. Option D describes a characteristic of a switch-controlled single-branch circuit, not a standard series/parallel circuit disadvantage.

Answer:

B. as more lights are added to the circuit, the voltage to each decreases.