Adding a Third Bulb in Parallel Circuit

What happens when a third light bulb is added to a circuit with two light bulbs wired in parallel?

A. The total resistance increases

B. The total resistance decreases

C. The total resistance remains the same

Answer: The total resistance decreases

When a third light bulb is added to a circuit with two light bulbs wired in parallel, the total resistance of the circuit decreases. This is because when light bulbs are connected in parallel, the total resistance decreases compared to when they are connected in series.

In a parallel circuit, each light bulb has its own path for current to flow, which means the overall resistance is lower as compared to a series circuit where the current has to pass through each light bulb sequentially. So, adding a third light bulb in parallel will further decrease the total resistance of the circuit.

This decrease in total resistance allows more current to flow through the circuit, brightening the light bulbs. It also means that if one light bulb were to burn out, the other bulbs would still light up because they each have their own current path.