Advanced Science Primary 6 Energy

A motor is connected to a battery in a closed circuit. When the motor turns, it also makes a loud buzzing sound. What is the energy conversion?

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

Step 1: The battery stores chemical potential energy. Step [2-9]: This is converted to electrical energy in the circuit. Step [2-9]: The motor converts electrical energy into kinetic (motion) and sound (buzzing).

Correct answer: Chemical potential energy → Electrical energy → Kinetic energy + Sound energy

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