What Happens to the Brightness of Bulb A in a Circuit?

Question:

What happens to the brightness of bulb A if you replace bulb B with a short circuit?

a) Bulb A's brightness does not change.

b) Bulb A goes out.

c) Bulb A gets dimmer.

d) Bulb A gets brighter.

Answer:

When bulb B is replaced with a short circuit in a circuit that shows three identical bulbs (bulbs A, B, and C), the brightness of bulb A changes. The correct answer is b) Bulb A goes out.

Explanation:

In a circuit with three identical bulbs, the current is divided equally among the bulbs when they are all functioning properly. However, when bulb B is replaced with a short circuit, it creates a low-resistance path for the current to flow through.

This diversion of current away from bulb A causes it to go out. Bulb A no longer receives the necessary current to produce light, so it becomes dark when the short circuit is introduced.

Essentially, the short circuit creates an easier path for the current to flow through, bypassing bulb A and causing it to lose its brightness.