Standard Science Primary 5 Systems

Study the circuit diagram below. Bulb B1 and B2 are in parallel, while B3 is in series with the battery. If Bulb B1 fuses, what will happen to Bulbs B2 and B3?

A B2 remains lit while B3 goes out.
B B2 remains lit and B3 remains lit.
C B2 and B3 both go out.
D B2 goes out while B3 remains lit.
Show Worked Solution

Worked Solution

Step 1: Identify the circuit arrangement. B1 and B2 are in parallel. Step [2-9]: If one branch of a parallel circuit breaks (B1 fuses), the other branch (B2) remains closed. Step [2-9]: Since B2 is still part of a closed circuit, current continues to flow through the main path where B3 is located.

Correct answer: B2 remains lit and B3 remains lit.

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free