Standard Science Primary 5 Systems

In the parallel circuit below, Bulb B2 fuses. What will happen to Bulb B1 and Bulb B3?

A Both Bulb B1 and Bulb B3 will go out.
B Bulb B1 will go out, but Bulb B3 will remain lit.
C Bulb B3 will go out, but Bulb B1 will remain lit.
D Both Bulb B1 and Bulb B3 will remain lit.
Show Worked Solution

Worked Solution

Step 1: Identify the arrangement as a parallel circuit with three branches. Step 2: In a parallel circuit, current has multiple pathways to flow from the battery and back. Step 3: If B2 fuses, only the middle branch is broken. Step 4: Current can still flow through the top branch (B1) and bottom branch (B3), so they remain lit.

Correct answer: Both Bulb B1 and Bulb B3 will remain lit.

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

Start Free Trial — 7 Days Free