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7 Cards in this Set
- Front
- Back
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What is the major rule of the conservation of energy |
Energy cannot be created or destroyed therefore it is the same as the start as at the end |
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Efficiency of energy equation |
Useful energy output/total energy input |
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Hairdryer transfers? |
Electric-->kinetic+heat |
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what is conduction?processes |
one end of solid is heated and particles at that end gain kinetic energy and vibrate more. this energy is passed to neighbouring particles and so energy is transferred |
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why are metals better conductors |
due to delocalised electrons gaining kinetic energy transferring energy by quickly colliding with other particles |
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what are the processes of convection? |
fluid is heated and becomes less dense as it expands and rises, the warm fluid is then replaced by cooler denser fluid- convection current transfers energy |
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how does infrared radiation work? |
all objects emit radiation- dark Matt surfaces emit more radiation and absorb more radiation- light shiny surfaces reflect radiation |
