P1A REVISION

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  • Created by: vignesh
  • Created on: 25-06-11 16:40

Heat is transfered in three different ways and they are:

  • Radiation
  • Conduction
  • Convection

But what are these funny looking words well...

Radiation is the transfer of heat energy by Electromagnetic waves. Radiation occurs in solids, liquids and gases.

Conduction involve the transfer of energy by particles. It is also the main form of heat transfer in solids.

Convection also involves the transfer of energy by particles. It is also the main form of heat transfer in liquids and gases.

Heat Convection

CONVECTION occurs when the more energetic particles MOVE from the HOTTER REGION to the COOLER REGION - AND TAKE THEIR HEAT ENERGY WITH THEM!

CONVECTION CURRENTS are all about CHANGES IN DENCITY!

Calculate the efficency

Its really sinple to Calculate the Efficiency of a machine

You do it like this....

Efficency = Useful energy output devided by the total energy input

Just like that!

But - Nodevice is 100% efficent and the wasted energy is always diddipated as heat

The

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