Energy Transfers Worksheet | PDF - Free Printable

Let's solve the Energy Transfers worksheet step by step. The task is to identify the energy in and energy out for each device, based on how energy is transferred.

We are given the following types of energy:
- Chemical potential
- Kinetic
- Elastic potential
- Electrical
- Gravitational potential
- Light
- Thermal
- Sound

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1. Battery-powered torch

- Energy in: Chemical potential
(The battery stores energy in chemical form, which is converted when the circuit is closed.)

- Device: Battery-powered torch
(This converts stored chemical energy into light and heat.)

- Energy out: Light and Thermal
(A torch mainly produces light, but some energy is lost as heat due to resistance in the bulb.)

✔ So, Energy out = Light + Thermal

> Note: In many simplified models, only "Light" is written, but thermal energy is also produced.

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2. Kettle

- Device: Kettle
(An electric kettle heats water using electricity.)

- Energy out: Thermal
(It outputs thermal energy to heat the water.)

- Energy in: Electrical
(The kettle runs on electricity from a power source.)

✔ So, Energy in = Electrical, Energy out = Thermal

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3. Microphone

- Device: Microphone
(Converts sound waves into electrical signals.)

- Energy in: Sound
(Sound waves hit the microphone’s diaphragm.)

- Energy out: Electrical
(The vibrations create small electrical signals that can be amplified or recorded.)

✔ So, Energy in = Sound, Energy out = Electrical

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4. Pendulum

- Device: Pendulum
(A swinging object, like in a clock.)

- Energy in: Gravitational potential
(When raised, it gains gravitational potential energy.)

- Energy out: Kinetic
(As it swings down, potential energy is converted into kinetic energy.)

But note: This is a continuous transfer between gravitational potential and kinetic energy.

So:
- At the highest point → maximum gravitational potential
- At the lowest point → maximum kinetic

✔ Therefore:
- Energy in = Gravitational potential
- Energy out = Kinetic

> Also, some energy is lost as thermal (due to air resistance and friction), but the main output energy is kinetic.

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Final Completed Diagram:

```
1. Battery powered torch
Energy in: Chemical potential
Device: Battery powered torch
Energy out: Light and Thermal

2. Kettle
Energy in: Electrical
Device: Kettle
Energy out: Thermal

3. Microphone
Energy in: Sound
Device: Microphone
Energy out: Electrical

4. Pendulum
Energy in: Gravitational potential
Device: Pendulum
Energy out: Kinetic
```

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Summary Table:

| Device | Energy In | Energy Out |
|---------------------|-------------------------|------------------------|
| Battery-powered torch | Chemical potential | Light, Thermal |
| Kettle | Electrical | Thermal |
| Microphone | Sound | Electrical |
| Pendulum | Gravitational potential | Kinetic |

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✔ Explanation of Energy Transfers:
- Energy is never created or destroyed — it is transferred from one form to another.
- Each device uses a specific input energy and converts it into useful output energy (with possible losses like heat).

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