Physics AQA GCSE 1.1 Heat Transfer Flashcards Set of flashcards for revising P1.1: Heat Transfer 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: Alex HarrisonCreated on: 05-05-13 17:27 1. What units is heat measured in? Joules 1 of 17 2. Why does your hand feel cold when you touch an ice cube? Heat energy transfers from your hand to the ice cube, causing it to warm up slightly. 2 of 17 3. What happens to the particles in something that is warmed up? They move more quickly 3 of 17 4. What do conductors have that allows them to conduct heat? Free Electrons 4 of 17 5. How do free electrons allow a conductor to conduct heat? Free electrons gain energy, and vibrate more, thus transferring energy to other electrons. 5 of 17 6. What happens when you heat water in a pan on a stove? The water at the bottom heats up, becoming less dense, and so rises to the top, replacing the cold water. 6 of 17 7. What is the above type of movement called? Convection current 7 of 17 8. Where does evaporation take place? On the surface of a liquid 8 of 17 9. What is the opposite of evaporation called? Condensation 9 of 17 10. What surfaces are very good at radiating and absorbing heat? Matt black surfaces 10 of 17 11. Why does putting tin foil behind radiators make them more efficient? It reflects heat back into the room instead of it being absorbed into the walls 11 of 17 12. Name four factors that can affect how quickly a liquid cools. Surface area, volume, material of container, temperature difference between it and the surroundings. 12 of 17 13. If a substance has a low U-Value, is it a good or bad insulator? Good 13 of 17 14. Specific Heat Capacity= Energy/mass*Δ Temperature 14 of 17 15. What does the specific heat capacity of a substance tell us? How much energy is needed to heat 1kg of a substance by 1 degree Celsius 15 of 17 16. Why is water used as the liquid in most radiators? It has a fairly high specific heat capacity, so it takes a long time to cool down 16 of 17 17. Which of the forms of heat transfer can take place in a vacuum? Radiation 17 of 17
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