Standard Science Primary 6 Energy

In a circuit with three bulbs and two switches, only one bulb lights up when both switches are closed. What is the most likely reason?

A The circuit is in parallel.
B The other two bulbs are fused.
C The switches are non-conductors.
D The battery is too weak.
Show Worked Solution

Worked Solution

Step 1: If the switches are closed, the circuit should be complete. Step 2: If only one bulb lights, the path to that bulb is working. Step 3: The other bulbs must have a break in their filament (fused) or a broken connection.

Correct answer: The other two bulbs are fused.

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

Start Free Trial — 7 Days Free