Energy Conversion Worksheet - Free Printable

Let's solve the worksheet step by step. The task is to name the objects shown in the images and state the energy conversion(s) that take place when each device operates.

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1) Desk Lamp

- Object Name: Desk lamp (or electric lamp)
- Energy Conversion:
- Electrical energy → Light energy
- Electrical energy → Heat energy (some heat is produced as a byproduct)

> 🔍 *Explanation:* When electricity flows through the filament (in an incandescent bulb) or LED, it produces light. However, some energy is lost as heat.

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2) Computer (Desktop)

- Object Name: Computer (desktop computer)
- Energy Conversion:
- Electrical energy → Light energy (monitor display)
- Electrical energy → Sound energy (speakers)
- Electrical energy → Heat energy (from processor, components)
- Electrical energy → Mechanical energy (fan cooling, hard drive movement)

> 🔍 *Explanation:* A computer uses electricity to power multiple functions: displaying visuals (light), producing sound, running internal fans (mechanical motion), and generating heat due to electronic activity.

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3) Iron (Electric Iron)

- Object Name: Electric iron
- Energy Conversion:
- Electrical energy → Heat energy

> 🔍 *Explanation:* The iron uses electricity to heat up its metal plate via a heating element. Its main purpose is to transfer heat to clothes.

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4) Speaker / Audio System

- Object Name: Speaker (or stereo system)
- Energy Conversion:
- Electrical energy → Sound energy

> 🔍 *Explanation:* The speaker converts electrical signals into sound waves using a diaphragm that vibrates.

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5) Electric Fan

- Object Name: Electric fan
- Energy Conversion:
- Electrical energy → Mechanical energy (rotation of blades)
- Electrical energy → Kinetic energy (air movement)
- Some electrical energy → Heat energy (due to motor resistance)

> 🔍 *Explanation:* The fan’s motor converts electricity into mechanical rotation, which moves air (kinetic energy). A small amount of energy is lost as heat.

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✔ Final Answers:

| # | Object Name | Energy Conversion(s) |
|---|---------------------|------------------------|
| 1) | Desk lamp | Electrical → Light & Heat |
| 2) | Computer | Electrical → Light, Sound, Heat, Mechanical |
| 3) | Electric iron | Electrical → Heat |
| 4) | Speaker | Electrical → Sound |
| 5) | Electric fan | Electrical → Mechanical (Kinetic) & Heat |

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📌 Note: In most cases, electrical energy is converted into other forms, but some heat is always produced due to inefficiencies (especially in motors, resistors, etc.).

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