Standard Science Primary 6 Energy

After being lit for 30 minutes, an incandescent bulb feels hot. This is because __________.

A electricity is a form of heat
B the glass is a good conductor of heat
C some electrical energy is converted into heat energy
D the bulb is faulty
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Worked Solution

Step 1: Bulbs convert electrical energy into light energy. Step 2: This conversion is never 100% efficient. Step 3: The "wasted" energy is released as heat energy.

Correct answer: some electrical energy is converted into heat energy

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