Standard Science Primary 5 Systems

Which of the following materials can be used to complete a circuit and light up a bulb?

A Graphite pencil lead
B Plastic ruler
C Glass rod
D Dry wooden stick
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Worked Solution

Step 1: To light the bulb, the material must be an electrical conductor. Step 2: Metals are typical conductors, but graphite (non-metal) also conducts electricity. Step 3: Plastics, glass, and dry wood are insulators.

Correct answer: Graphite pencil lead

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