Standard Science Primary 5 Systems

In the circuit shown below, Bulb B1 is lit. What will happen to Bulb B1 if another identical bulb, B2, is added in parallel to it?

A Bulb B1 will remain the same brightness.
B Bulb B1 will become brighter.
C Bulb B1 will go out.
D Bulb B1 will become dimmer.
Show Worked Solution

Worked Solution

Step 1: In a parallel circuit, each branch is connected directly across the power source. Step [2-9]: Adding a new branch with Bulb B2 does not change the voltage across the branch containing Bulb B1. Step [2-9]: Therefore, the current through B1 and its brightness remain the same.

Correct answer: Bulb B1 will remain the same brightness.

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