energy transfer diagrams and dissipation.pptx

physics year 7

1. EnergyTransfers Diagrams and Dissipation

2. Energy transfer diagram is a useful way for showing energy transfer chemical energy store electric current sound thermal energy store from chemical energy to thermal energy by an electric current and light

3. transfering energy with forces chemical energy store forces elastic energy store from chemical energy to elastic energy by force (pull)

4. transfering energy involving gravity chemical energy store forces kinetic energy store from chemical energy store to kinetic energy store by force (as the cyclist start cyling) A A

5. transfering energy involving gravity kinetic energy store forces gravitational energy store from kinetic energy store to gravitational energy store by force (as the cyclist goes up the hills) B B

6. transfering energy involving gravity gravitational energy store gravity forces kinetic energy store from gravitational energy store to kinetic energy store by force (as the cyclist goes down the hill) C B C

7. Energy dissipation chemical energy store electric current thermal energy store in surroundings the wasted energy where the energy cannot be used heating is not useful and energy is dissipated light heating

8. Energy transfers – what is happening? Chemical energy store in the battery Electric current in the wires Energy transferred to the surroundings Increase in the thermal energy store of the surroundings Task: Match the correct statement to the correct box to show how energy is transferred by a torch. Light waves

9. Chemical energy store in the battery Electric current in the wires Energy transferred to the surroundings Light waves Increase in the thermal energy store of the surroundings Self-assessment:

10. Task: Complete the energy transfer diagrams : Ch______ energy store in the candle Energy is transferred to the surroundings El______ energy is transferred to the TV Energy is transferred to the surroundings

11. Chemical energy store in the candle Energy is transferred to the surroundings Electrical energy is transferred to the TV Energy is transferred to the surroundings Energy is transferred as light waves. Energy is transferred to the thermal energy store of the surroundings. Energy is transferred as light waves. Energy is transferred as sound waves . Energy is transferred to the thermal energy store of the surroundings Self-assessment: