Conservation of Energy and Energy Transfers

Conservation of Energy and Energy Transfers

1. Dissipate: Ways in which energy is being wasted

2. Energy Transfers

   • In a system, energy transforms from one form to the other
   • In a closed system, there is no change in net in total energy
   • Sometimes the transfer is not useful, it is wasted
   • Dissipation is one time of transfer

3. Example

   • A kettle boiling water. The kettle is supplied with electrical energy which is transferred to thermal energy in the water.

4. Reducing Energy Dissipation

   • Double glazed windows trap air in the house
   • Loft insulation reduces heat loss
   • Carpets reduce heat loss

5. Thermal Conductivity

   • This is the amount of energy transferred through a material
   • Brick and Glass have a low thermal energy
   • High thermal conductivity means high energy transfer