Conduction, convection or radiation worksheet - Free Printable

To solve the problem, we need to identify whether each image represents conduction, convection, or radiation. Let's analyze each image step by step:

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1. Toaster

- Explanation: The toaster heats bread using an electric heating element inside the toaster. The heat is transferred directly from the hot metal surface to the bread.
- Type of Heat Transfer: Conduction

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2. Hair Dryer

- Explanation: A hair dryer uses a fan to blow warm air over wet hair. The warm air rises and circulates, drying the hair.
- Type of Heat Transfer: Convection

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3. Iron

- Explanation: An iron works by transferring heat directly from its hot metal base to the fabric being pressed. The heat moves through direct contact.
- Type of Heat Transfer: Conduction

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4. Campfire

- Explanation: A campfire emits heat in all directions without requiring any medium (like air or water). This is typical of radiation.
- Type of Heat Transfer: Radiation

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5. Oven with Steam

- Explanation: The oven heats food using hot air that circulates around it. The movement of heated air is characteristic of convection.
- Type of Heat Transfer: Convection

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6. Sunbathing

- Explanation: The sun warms the person through electromagnetic waves (light and heat) traveling through space. This is radiation.
- Type of Heat Transfer: Radiation

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7. Barbecue Grill

- Explanation: The grill heats food directly by placing it on the hot metal grates. The heat is transferred through direct contact.
- Type of Heat Transfer: Conduction

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8. Microwave Oven

- Explanation: A microwave oven uses electromagnetic waves (microwaves) to heat food. These waves penetrate the food and cause molecules to vibrate, generating heat.
- Type of Heat Transfer: Radiation

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9. Hot Coffee Cup

- Explanation: The steam rising from the hot coffee cup indicates that the heat is moving through the surrounding air, which is a form of convection.
- Type of Heat Transfer: Convection

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10. Frying Pan on Fire

- Explanation: The pan is heated directly by the flame, and the heat is transferred to the food through direct contact with the hot metal surface.
- Type of Heat Transfer: Conduction

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11. Hair Straightener

- Explanation: The hair straightener heats up due to electricity, and the heat is transferred directly to the hair through the hot metal plates.
- Type of Heat Transfer: Conduction

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12. Air Conditioner

- Explanation: An air conditioner cools the room by circulating cold air. The movement of air is a form of convection.
- Type of Heat Transfer: Convection

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Final Answer

1. Conduction
2. Convection
3. Conduction
4. Radiation
5. Convection
6. Radiation
7. Conduction
8. Radiation
9. Convection
10. Conduction
11. Conduction
12. Convection

Boxed Answer:
\[
\boxed{
\begin{array}{ccc}
1. \text{Conduction} & 2. \text{Convection} & 3. \text{Conduction} \\
4. \text{Radiation} & 5. \text{Convection} & 6. \text{Radiation} \\
7. \text{Conduction} & 8. \text{Radiation} & 9. \text{Convection} \\
10. \text{Conduction} & 11. \text{Conduction} & 12. \text{Convection} \\
\end{array}
}
\]