Standard Science Primary 5 Systems

What is the function of the filament inside a light bulb?

A To act as an electrical insulator.
B To heat up and give off light when current flows through it.
C To act as a switch.
D To provide electrical energy.
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Worked Solution

Step 1: The filament is a thin wire (usually tungsten) inside the bulb. Step 2: It is a conductor with high resistance. Step 3: When electric current flows through it, the resistance causes it to heat up significantly until it glows, producing light.

Correct answer: To heat up and give off light when current flows through it.

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