Standard Science Primary 5 Systems

Look at the circuit diagram below. What happens if Bulb B1 fuses?

A Bulb B2 will go out, but Bulb B3 will remain lit.
B Bulb B2 and Bulb B3 will remain lit.
C Bulb B2 and Bulb B3 will become brighter.
D Bulb B2 and Bulb B3 will go out.
Show Worked Solution

Worked Solution

Step 1: Identify that the circuit is a series circuit. Step 2: In a series circuit, there is only one path for the electric current to flow. Step 3: If Bulb B1 fuses, its filament breaks, creating an open circuit (a gap). Step 4: Current cannot flow through the gap, so all other bulbs in the same loop will go out.

Correct answer: Bulb B2 and Bulb B3 will go out.

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