1、7I Energy Resources我的能源资源幻灯片PPT 本本PPTPPT课件仅供大家学习使用课件仅供大家学习使用 请学习完及时删除处理请学习完及时删除处理 谢谢！谢谢！7I Energy Resources7I Energy Resources Contents Contents The nature of energyThe nature of energy Energy resources Energy resources Fossil fuels Fossil fuels Summary activities Summary activitiesCan you think of
2、examples of each type of energy?There are many different types of energy:thermalthermallightlightsoundsoundelasticelasticgravitationalgravitationalkinetickineticelectricalelectricalchemicalchemicalnuclearnuclear Different types of energy Different types of energy Which type of energy?Which type of e
3、nergy?Energy can be changed from one form to another.For example:lChemical energy in food is converted to thermal energy and kinetic energy by our bodies.Energy transfer Energy transferWhat other energy transfers can you think of?lGravitational energy in a ball is converted to kinetic energy when it
4、 falls to the ground.l burning match burning match l portable torch portable torchl microphone microphonel radio radiol television televisionl catapult catapultl mobile phone mobile phonel car car chemical to chemical to heatheat and light and lightchemical to heat and chemical to heat and lightligh
5、tsound to electricalsound to electricalelectrical to electrical to soundsound and heat and heatelectrical to electrical to soundsound and and lightlight and heat and heatelastic to elastic to kinetickinetic and heat and heatchemical to chemical to soundsound and and microwavesmicrowaves(EM radiation
6、)and heat(EM radiation)and heatchemical to chemical to kinetickinetic and sound and heat and sound and heatIn all these transfers the energy is not lost,it is conserved.Energy cannot be destroyed or created.Energy cannot be destroyed or created.What energy transfer takes place in each device?What is
7、 the energy transfer?What is the energy transfer?7I Energy Resources7I Energy Resources Contents Contents The nature of energy The nature of energy Energy resources Energy resources Fossil fuels Fossil fuels Summary activities Summary activitiesHumans use chemical energy(from food)to live and functi
8、on.However,in a modern society we also use large amounts of energy from other sources.Can you think of some activities requiring energy?Where does the energy for these type of activities come from?l travelling and communicating over long distances;l controlling our environment,e.g.air conditioning/h
9、eating;l manufacturing and building many kinds of materials and products,e.g.roads,cars,buildings,prepared food.Using energy Using energyEnergy resources can be divided into two types:l renewable renewable(e.g.hydroelectric);l non-renewable non-renewable(e.g.coal,oil,nuclear and natural gas).Energy
10、resources in the UK Energy resources in the UKThere is a finite amount of fossil fuels on the Earth and they will eventually run out.Once fossil fuels are used they cannot be regenerated and used again,so they are called non-renewablenon-renewable.Non-renewable energy resources Non-renewable energy
11、resourcesoilcoalnatural gasOil,coal and natural gas are examples of fossil fuelsfossil fuels.They were formed from biological deposits over the course of millions of years.RenewableRenewable energy resources will not run out because they can easily be regenerated.NoImageNoImageOnly 2%of the UKs ener
12、gy comes from renewable sources.Can you think of a reason why?Renewable energy sources Renewable energy sourcesExamples of renewable energy resources are:l wind powerwind powerl solar power solar powerl tidal power tidal powerl biomass biomass Renewable or non-renewable?Renewable or non-renewable?Th
13、e SunThe SunThe Sun is the original source of most energy resources.Plants store the Suns energy through photosynthesis.Animals then eat the plants.Energy and the Sun Energy and the Suncoalcoalwindwindbiomassbiomassoiloil The Sun isthe original source of most energy resources.natural gasnatural gasf
14、oodfood Energy resources from the Sun Energy resources from the Sunwaveswaves7I Energy Resources7I Energy Resources Contents Contents The nature of energy The nature of energy Energy resources Energy resources Fossil fuels Fossil fuels Summary activities Summary activities Fossil fuels Fossil fuelsA
15、bout 300 million years ago,trees and other plants photosynthesizedphotosynthesized and stored the Suns energy.Dead plants fell into swampy water and the mud prevented them from rotting away.How coal was formed How coal was formedOver the years,the mud piled up and squashed the plant remains.After mi
16、llions of years under this pressure,the mud became rock and the dead plants became coalcoal.Coal formation Coal formationOil and gas are also biological in origin.Millions of years ago tiny animals lived in the sea.Like today,their ecosystem was dependent on heat and light from the Sun and photosynt
17、hesis by plants.When they died they fell into mud and sand at the bottom of the sea but did not rot away.Over millions of years,they got buried deeper by the mud and sand.The temperature and pressure(caused by the weight of the sediments and deep burial)changed the mud and sand into rock and the dea
18、d animals into crude oil and natural gas.This sample of crude oil was formed in southern England.Crude oil formed in other parts of the world can be very different in appearance and viscosity.How oil and gas were formed How oil and gas were formed Oil and gas formation Oil and gas formation7I Energy
19、 Resources7I Energy Resources Contents Contents The nature of energy The nature of energy Energy resources Energy resources Fossil fuels Fossil fuels Summary activities Summary activities Glossary Glossaryl energyenergy The ability to do work it exists in different forms such as chemical,electrical,
20、heat and light.l energy transferenergy transfer Changing energy from one form to another.l energy resourceenergy resource A substance that is a source of energy.l fuelfuel A substance that releases energy when it burns.l fossil fuelfossil fuel A fuel that is formed from the remains of dead plants and animals,such as coal,oil and natural gas.l non-renewable non-renewable An energy resource that cannot be replaced and will eventually run out.l renewablerenewable An energy resource that can be replaced and will not run out.Anagrams Anagrams Multiple-choice quiz Multiple-choice quiz
