Standard Science Primary 6 Energy

Siti uses a solar-powered garden light. What is the main energy conversion that takes place when the light is on at night?

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

Step 1: During the day, solar energy is stored in the battery as chemical potential energy. Step [2-9]: At night, the battery converts chemical to electrical energy. Step [2-9]: The LED converts electrical to light and heat energy.

Correct answer: Chemical potential energy → Electrical energy → Light energy + Heat energy

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