Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download P1 2.1 Energy transfers
Document related concepts
Dark energy wikipedia , lookup
Efficient energy use wikipedia , lookup
Potential energy wikipedia , lookup
Kinetic energy wikipedia , lookup
William Flynn Martin wikipedia , lookup
Open energy system models wikipedia , lookup
100% renewable energy wikipedia , lookup
Energy subsidies wikipedia , lookup
Energy storage wikipedia , lookup
Low-Income Home Energy Assistance Program wikipedia , lookup
Public schemes for energy efficient refurbishment wikipedia , lookup
Zero-energy building wikipedia , lookup
Regenerative brake wikipedia , lookup
World energy consumption wikipedia , lookup
Low-carbon economy wikipedia , lookup
Energy Charter Treaty wikipedia , lookup
Gibbs free energy wikipedia , lookup
Energy policy of Australia wikipedia , lookup
Alternative energy wikipedia , lookup
Internal energy wikipedia , lookup
International Energy Agency wikipedia , lookup
Life-cycle greenhouse-gas emissions of energy sources wikipedia , lookup
Distributed generation wikipedia , lookup
Energy harvesting wikipedia , lookup
Energy policy of the United Kingdom wikipedia , lookup
Energy returned on energy invested wikipedia , lookup
Energy policy of Finland wikipedia , lookup
Energy efficiency in transport wikipedia , lookup
Energy in the United Kingdom wikipedia , lookup
Conservation of energy wikipedia , lookup
Negawatt power wikipedia , lookup
Energy policy of the European Union wikipedia , lookup
United States energy law wikipedia , lookup
Energy efficiency in British housing wikipedia , lookup
Energy Independence and Security Act of 2007 wikipedia , lookup
Transcript
The energy transferred in this picture is……. Learning objectives • Describe the energy transfers in a range of devices. • Identify where energy is wasted. • Explain why wasted energy is difficult to use. Forms of energy click Forms of energy • Energy is needed to keep us working, and to operate all the machines around us. • Different forms of energy include….. • Light, sound, electrical, potential and kinetic energy. • Energy can also be stored. Nuclear energy is stored inside atoms. Food, fuels and electric batteries are stores of Chemical energy. • Anything that is squashed, stretched or twisted stores Elastic potential energy. • An object in a high position stores energy as Gravitational potential energy. Energy transfers • Machines transfer energy between different forms. • An mp3 player transfers stored chemical energy into electrical energy and sound energy. • Sometimes more than one transfer is involved. The engine of a car transfers chemical energy in the petrol into kinetic energy (useful) and heat and sound (not useful and called wasted energy). • Click (select no option) Q) Label the useful and the wasted energy Conservation of energy • Energy cannot be created or destroyed, it can only be transferred usefully, stored or wasted (called dissipated). • THE TOTAL AMOUNT OF ENERGY DOES NOT CHANGE. • This is called the principle of conservation of energy. Spreading out • If you look at an energy transfer it can often seem as if some of the energy has ‘disappeared’. • For example, a car uses chemical energy stored in its fuel. • The fuel stores a lot of energy in a small space. This chemical energy is eventually transferred by heating into the surroundings, which become warmer. This dissipated energy is very difficult to use for further energy transfers. Questions What are the energy transfers of a torch? You are running in sports day. What forms of energy are you transferring that are A) useful and B) wasted? A car uses a litre of petrol when it is driven to the shops and back. What happens to the chemical energy that was stored in the petrol? What are the forms of energy produced in a Bunsen burner? If energy cannot be destroyed, how can we ‘waste’ energy? Draw a flow chart to show all the energy transfers in a wind-up torch, starting with food. Show how energy is wasted at each stage.
