Energy transfer

?
  • Created by: alexda
  • Created on: 17-05-14 23:32
View mindmap
  • 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.
    • 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.

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Energy resources »