7IEnergyResources我的能源資源幻燈片課件

1、7I Energy Resources我的能源資源幻燈片PPT 本PPT課件僅供大家學(xué)習(xí)使用 請學(xué)習(xí)完及時刪除處理 謝謝！7I Energy Resources我的能源資源幻燈片PP7I Energy Resources Contents The nature of energy Energy resources Fossil fuels Summary activities7I Energy Resources ConteCan you think of examples of each type of energy?There are many different types of ene

2、rgy: thermallightsoundelasticgravitationalkineticelectricalchemicalnuclear Different types of energy Can you think of examples of e Which type of energy? Which type of energy? Energy can be changed from one form to another. For example:Chemical energy in food is converted to thermal energy and kinet

3、ic energy by our bodies. Energy transferWhat other energy transfers can you think of?Gravitational energy in a ball is converted to kinetic energy when it falls to the ground.Energy can be changed from one burning match portable torch microphone radio television catapult mobile phone car chemical to

4、 heat and lightchemical to heat and lightsound to electricalelectrical to sound and heatelectrical to sound and light and heatelastic to kinetic and heatchemical to sound and microwaves(EM radiation) and heatchemical to kinetic and sound and heatIn all these transfers the energy is not lost, it is c

5、onserved. Energy cannot be destroyed or created.What energy transfer takes place in each device? What is the energy transfer? burning match chemical to hea7I Energy Resources Contents The nature of energy Energy resources Fossil fuels Summary activities7I Energy Resources ConteHumans use chemical en

6、ergy (from food) to live and function. 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?travelling and communicating over long distances;controlling our e

7、nvironment, e.g. air conditioning/heating;manufacturing and building many kinds of materials and products, e.g. roads, cars, buildings, prepared food. Using energyHumans use chemical energy (frEnergy resources can be divided into two types: renewable (e.g. hydroelectric); non-renewable (e.g. coal, o

8、il, nuclear and natural gas). Energy resources in the UKEnergy resources can be divideThere 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-renewable. Non-renewable energy re

9、sourcesoilcoalnatural gasOil, coal and natural gas are examples of fossil fuels. They were formed from biological deposits over the course of millions of years.There is a finite amount of foRenewable energy resources will not run out because they can easily be regenerated. Only 2% of the UKs energy

10、comes from renewable sources. Can you think of a reason why? Renewable energy sourcesExamples of renewable energy resources are: wind power solar power tidal power biomassRenewable energy resources wil Renewable or non-renewable? Renewable or non-renewab The SunThe Sun is the original source of most

11、 energy resources.Plants store the Suns energy through photosynthesis.Animals then eat the plants. Energy and the Sun The Sun Energy and the Scoalwindbiomassoil The Sun isthe original source of most energy resources.natural gasfood Energy resources from the Sunwavescoalwindbiomassoil The Sun isn7I E

12、nergy Resources Contents The nature of energy Energy resources Fossil fuels Summary activities7I Energy Resources Conte Fossil fuels Fossil fuelsAbout 300 million years ago, trees and other plants photosynthesized and stored the Suns energy.Dead plants fell into swampy water and the mud prevented th

13、em from rotting away. How coal was formedOver the years, the mud piled up and squashed the plant remains.After millions of years under this pressure, the mud became rock and the dead plants became coal.About 300 million years ago, t Coal formation Coal formationOil and gas are also biological in ori

14、gin. Millions of years ago tiny animals lived in the sea. Like today, their ecosystem was dependent on heat and light from the Sun and photosynthesis 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

15、 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 dead 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

16、very different in appearance and viscosity. How oil and gas were formedOil and gas are also biologica Oil and gas formation Oil and gas formation7I Energy Resources Contents The nature of energy Energy resources Fossil fuels Summary activities7I Energy Resources Conte Glossaryenergy The ability to d

17、o work it exists in different forms such as chemical, electrical, heat and light. energy transfer Changing energy from one form to another.energy resource A substance that is a source of energy.fuel A substance that releases energy when it burns.fossil fuel A fuel that is formed from the remains of dead plants and animals, such