Standard Science Primary 5 Systems

Study the circuit diagram below. Bulb B1 is fused. What will happen to Bulb B2?

A It will remain lit.
B It will become brighter.
C It will go out.
D It will flicker.
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Worked Solution

Step 1: Identify the arrangement. The bulbs are in a series circuit. Step 2: A series circuit has only one pathway for electric current. Step 3: If B1 is fused, the filament is broken, creating an open circuit. Step 4: Current cannot flow to B2, so it will go out.

Correct answer: It will go out.

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