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Convection P1
| Question | Answer |
|---|---|
| Define convection. | The process by which particles with more energy move from hotter regions to cooler regions, taking energy with them. |
| Explain how convection currents carry heat from a radiator round a room.(3) | • Less dense hot air rises from the radiator • Goes to the roof and displaces hot air • Cool, denser air falls and fills gaps left by the hot air- goes back to the radiator |
| Part 1 Explain how heat is transferred through an immersion heater by convection.(5) | Part 1 • Heat energy transferred to coils by conduction • Particles near the coils get more energy and start to move faster, becoming less dense • Hot water rises above dense cool water at the top of the tank and displaces it |
| Part 2 Explain how heat is transferred through an immersion heater by convection.(5) | • Cool, dense water falls to the bottom of the tank • Cool dense water heated by coils |
| Why is convection most efficient in square/round containers? | Because convection currents flow better |
| Why wouldn't you get hot water below the coils in an immersion heater? | Because there is no conduction to the cold water |
Created by:
GuyBrazier
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