Standard Science Primary 6 Energy

When a television set is switched on, which of the following represents the main energy conversions that occur?

A Chemical potential energy → Electrical energy → Light energy
B Light energy → Electrical energy → Sound energy
C Electrical energy → Light energy + Sound energy + Heat energy
D Electrical energy → Kinetic energy → Sound energy
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Worked Solution

Step 1: The input is electrical energy from the power socket. Step [2-9]: The useful outputs are light (screen) and sound (speakers). Step [2-9]: Heat energy is also produced as a wasted byproduct.

Correct answer: Electrical energy → Light energy + Sound energy + Heat energy

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