Energy transfer
- Created by: alexda
- Created on: 17-05-14 23:32
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- Energy transfer
- The amount of energy in the Universe is constant.
- The energy input will always equal the energy output.
- But only some of the output energy is useful because some of the input energy is always lost or wasted.
- Energy can never be created nor destroyed - It can only ever be transferred from one form to another.
- The energy input will always equal the energy output.
- Energy efficiency is the percentage of the energy transfer that is useful.
- The less energy that is wasted the more efficient the machine is. This means you waste less money paying for energy that you can't use.
- Heat radiation
- An object that is hotter than its surroundings emits more radiation that it absorbs,
- An object that is cooler than its surroundings absorbs more radiation that it emits.
- Dark matt surfaces absorbs heat radiation better than bright glossy surfaces. They also emit more heat radiation.
- Silvered surfaces reflect heat radiation so they radiate less heat energy than dark objects.
- If the rate of energy absorbed is equal to the rate of energy emitted the temperature of the object will remain constant.
- The amount of energy in the Universe is constant.
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