Let's solve each row of the
Energy Transfers worksheet step by step, based on how energy is transformed in each device.
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🔹 1. Battery Powered Torch
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Energy In: *Chemical Potential*
(This is already given — the battery stores energy chemically.)
-
Device: *Battery Powered torch*
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Energy Out: Light and Thermal
→ The battery converts chemical energy into electrical energy, which then powers the bulb to produce
light. Some energy is also lost as
heat (thermal) due to resistance in the filament.
✔ Answer:
Energy Out = Light and Thermal
> Note: Sometimes just "Light" is accepted, but technically, all devices lose some energy as heat.
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🔹 2. Kettle
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Energy In: Electrical
→ A kettle is plugged into a power source, so it uses
electrical energy.
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Device: *Kettle*
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Energy Out: *Thermal*
→ This is already given. The kettle heats water, so thermal (heat) energy is produced.
✔ Answer:
Energy In = Electrical
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🔹 3. Microphone
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Energy In: Sound
→ A microphone detects sound waves (vibrations in air), which are a form of
sound energy.
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Device: *Microphone*
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Energy Out: Electrical
→ The microphone converts sound vibrations into electrical signals that can be amplified or recorded.
✔ Answer:
Energy In = Sound
Energy Out = Electrical
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🔹 4. Pendulum
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Energy In: Gravitational Potential
→ When you lift the pendulum bob to the side, you give it
gravitational potential energy.
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Device: *Pendulum*
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Energy Out: Kinetic
→ As the pendulum swings down, gravitational potential energy is converted into
kinetic energy (energy of motion). At the lowest point, kinetic energy is maximum.
> Note: Energy is continuously transferred between
gravitational potential and
kinetic as the pendulum swings.
✔ Answer:
Energy In = Gravitational Potential
Energy Out = Kinetic
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✔ Final Completed Table:
| Energy In | Device | Energy Out |
|------------------------|----------------------|------------------------|
| Chemical Potential | Battery Powered torch |
Light and Thermal |
|
Electrical | Kettle | Thermal |
|
Sound | Microphone |
Electrical |
|
Gravitational Potential | Pendulum |
Kinetic |
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📌 Summary of Energy Transfers:
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Torch: Chemical → Electrical → Light + Thermal
-
Kettle: Electrical → Thermal
-
Microphone: Sound → Electrical
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Pendulum: Gravitational Potential ↔ Kinetic (back and forth)
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Parent Tip: Review the logic above to help your child master the concept of energy transfer worksheet.
