Energy Transfer Worksheet

Year 10 Science — Energy Transfer and Transformation

Name:

Date:

📖 Key Concepts

Conduction: Transfer of heat through direct contact between particles. Common in solids.

Convection: Transfer of heat through the movement of fluids (liquids or gases). Warmer fluid rises, cooler fluid sinks, creating a convection current.

Radiation: Transfer of energy as electromagnetic waves (e.g. infrared). Does not require a medium — can travel through a vacuum.

Energy Transformation: Energy changing from one form to another (e.g. chemical → thermal → kinetic).

🔵 Part 1: Multiple Choice

Circle the best answer for each question.

1. A metal spoon sitting in a hot bowl of soup gets warm at the handle. Which method of energy transfer is this?

Convection

Conduction

Radiation

Transformation

2. The Sun warms the Earth's surface even though space is a vacuum. Which method of energy transfer allows this?

Conduction

Convection

Radiation

Absorption

3. When water in a pot is heated on a stove, warm water rises and cool water sinks. This is an example of:

Conduction

Radiation

Convection

Evaporation

4. A torch converts chemical energy (from batteries) into light and heat energy. This is an example of:

Energy transfer by conduction

Energy transformation

Convection current

Radiation absorption

5. Which of the following materials would be the BEST conductor of heat?

Wood

Plastic

Copper

Rubber

✏️ Part 2: Short Answer

6. Identify the method of energy transfer (conduction, convection, or radiation) for each example below:

a) Feeling warmth from a campfire without touching it: _______________________

b) Hot air rising near a heater in a room: _______________________

c) Holding a cold ice block and your hand feels cold: _______________________

7. Describe what happens to particles in a solid when it is heated. How does this cause energy to transfer by conduction?

8. A solar panel converts sunlight into electricity to power a fan. List the energy transformations that occur in order, from sunlight to moving air.

9. Explain why wearing a dark-coloured jersey on a sunny day makes you feel warmer than wearing a white jersey. Use the word radiation in your answer.

10. A house loses heat through its walls on a cold winter night (temperature outside: 4°C, inside: 20°C). Suggest TWO ways the homeowner could reduce heat loss, and explain which method of energy transfer each one addresses.

✅ Answer Guide (Teacher Reference)

Part 1: Multiple Choice

1. Conduction — heat transfers through the solid metal spoon by direct particle contact.

2. Radiation — electromagnetic waves travel through the vacuum of space.

3. Convection — warm water rises and cool water sinks, forming a convection current.

4. Energy transformation — chemical energy → light energy + thermal energy.

5. Copper — metals are good conductors; wood, plastic, and rubber are insulators.

Part 2: Short Answer

6. a) Radiation b) Convection c) Conduction

7. Suggested answer: When a solid is heated, its particles gain energy and vibrate faster/more vigorously. These vibrations are passed on to neighbouring particles, transferring energy through the material from the hotter end to the cooler end.

8. Suggested answer: Solar (light/radiant) energy → electrical energy → kinetic (mechanical) energy → movement of air (kinetic energy in air particles).

9. Suggested answer: Dark colours absorb more radiation (infrared energy) from the sun, so more energy is transferred to the body as heat. White colours reflect more radiation, so less energy is absorbed.

10. Suggested answers (accept any two): 1) Insulating the walls with fibreglass or foam — reduces conduction through the walls. 2) Double-glazed windows — reduces conduction and convection through the window. 3) Curtains — reduces radiation and convection near windows. 4) Draught-stopping gaps — reduces convection of warm air escaping.