Standard Science Primary 5 Systems

Siti set up a circuit with two bulbs and two batteries. She noticed that when one bulb was removed, the other bulb remained lit. How were the bulbs arranged?

A The circuit was open.
B The bulbs were arranged in series.
C One battery was flat.
D The bulbs were arranged in parallel.
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Worked Solution

Step 1: Identify the observation (one bulb stays lit while another is removed). Step 2: Recall that in a parallel circuit, there are multiple paths for electricity. Step 3: If one path is broken, current can still flow through the other paths. Step 4: Conclusion: Parallel arrangement.

Correct answer: The bulbs were arranged in parallel.

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