Sourcesofenergy [Recovered]

8/13/2019 Sourcesofenergy [Recovered]

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http://www.google.com.my/url?sa=i&rct=j&q=&source=images&cd=&cad=rja&docid=gHmK4amuyxdpIM&tbnid=RltAalEZzMKa6M:&ved=0CAUQjRw&url=http://www.energy4me.org/energy-facts/energy-sources/&ei=JDnDUajKDITnrAf35YD4AQ&bvm=bv.48175248,d.bmk&psig=AFQjCNHumP5GvCDQjc9ToCLI8rz6otix9Q&ust=1371834783371788


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6.1 THE VARIOUS FORMS AND SOURCES OF ENERGY

Typesof

energy

Electricalenergy

Soundenergy

Nuclearenergy

Mechanicalenergy

Potentialenergy Kinetic

energy

Heatenergy

Lightenergy

Chemicalenergy


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Electrical energyo We get electrical energy frombatteries,

dynamos and electrical generators.

o Electrical energy can be changed intoother forms of energy. When we use an

electric iron, electrical energy is changed

into heat energy.


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Battery Dynamo
http://www.google.com.my/url?sa=i&rct=j&q=&source=images&cd=&cad=rja&docid=KtYyNzxiBvMjcM&tbnid=5eL_gkZoZrQ7vM:&ved=0CAUQjRw&url=http://commons.wikimedia.org/wiki/File:02_-_Single_Energizer_Battery.jpg&ei=EAfEUazDPIWVrAftiYDYCA&bvm=bv.48293060,d.bmk&psig=AFQjCNE1AbxLWR87Qys991IsKHH_E15g6w&ust=1371887749205978http://www.google.com.my/url?sa=i&rct=j&q=bicycle+dynamo&source=images&cd=&cad=rja&docid=qgN1dEwdsaYjzM&tbnid=HCE9KMDTbu-ONM:&ved=0CAUQjRw&url=http://www.bbc.co.uk/bitesize/standard/physics/energy_matters/source_to_consumer/revision/2/&ei=gQfEUd6oHMbQrQeOwoGQAw&bvm=bv.48293060,d.bmk&psig=AFQjCNE9W62XtJQaOe-mepBNCkIW2gYRIg&ust=1371887820947921


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Generator
http://www.google.com.my/url?sa=i&rct=j&q=hydroelectric+generator&source=images&cd=&cad=rja&docid=7nftEr9Zh7E6jM&tbnid=nv1-vYL2j__sSM:&ved=0CAUQjRw&url=http://www.opg.com/power/hydro/howitworks.asp&ei=JAjEUc3eFsfrrQeD6ID4AQ&bvm=bv.48293060,d.bmk&psig=AFQjCNFhJui8wHh5aJSFP4pGh3KXw4NfWw&ust=1371888029143294


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Sound energyo Sound energy is produced when an object

vibrates. When we beat a drum or sing,

sound energy is produced.

o When an object vibrates it moves

backwards and forwards.

o Sound waves can travel through solids,

liquids and gases but cannot travel

through a vacuum.


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o

Sound waves can travel in agas, liquid ora solid because they all contain particles.When an object vibrates it makes theparticles next to it in the gas, liquid or solid

vibrate too.o Sound waves travel the fastest in solids

followed by liquids and gases. This isbecause the particles in solids are closelypacked. The particles in liquids arefurtherapart than in solids. The particles in gasesare very far apart.


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Production of sound by vibration


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Kinetic energyo Kinetic energy is found in moving objects.

For example, a moving bus, a swingingpendulum and a fan with turning blades, allhave kinetic energy.

o The kinetic energy of a moving water is

very useful. It is used to rotate the

generatorsin a hydroelectric powerstation. The kinetic energy of awind isused to turn a windmill.


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A turning windmillA moving bus
http://www.google.com.my/url?sa=i&rct=j&q=WINDMILL&source=images&cd=&cad=rja&docid=GBD9ig7WeV-TEM&tbnid=GjlMAyqwlpbrHM:&ved=0CAUQjRw&url=http://www.3d-savers.com/free-3d-windmill-screensaver.html&ei=1RjEUYTPDsnhrAeG_IHQCA&bvm=bv.48293060,d.bmk&psig=AFQjCNEmOpO0IQT7Q1LtX1vmJQJS7TYHoA&ust=1371892303027695http://www.google.com.my/url?sa=i&rct=j&q=&source=images&cd=&cad=rja&docid=Uv6Z4Ah4dhC0dM&tbnid=SL1c7iBipZeQpM:&ved=0CAUQjRw&url=http://www.rsadagency.com/transit-advertising/&ei=oxjEUYuHENCHrAev7oGwDg&bvm=bv.48293060,d.bmk&psig=AFQjCNFz0yCI1IhaNF6h_Wsj3eHL1SS6sw&ust=1371892249475116


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Light energy

o Light energy helps us to see. We can seeobjects when light enters our eyes.

o Sources of light energy includes the Sun,

candles, torches and campfires give outlight energy.

o Lighttravels much faster than sound(one

million times faster). That is why youseelightning before youhear thunder.


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Video on lightning and thunder:


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Heat energyoA hot object has heat energy.

oAn object becomes hotterwhen it absorbs

heat energy and becomes coolerwhen itloses heat energy.

o Heat energy flows from an area of higher

temperature to an area of lowertemperature.

o Combustion of fuels such as wood, coal,

oil and natural gas produces heat energy.


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o Heat energy is used for cooking, boilingwater and ironing clothes.

Heat flows from an area of higher temperature to an area of lower temperature
http://www.google.com.my/url?sa=i&rct=j&q=&source=images&cd=&cad=rja&docid=QQcpDaj2OrL7TM&tbnid=msA376NdZW5qHM:&ved=0CAUQjRw&url=http://www.g9toengineering.com/resources/heattransfer.htm&ei=cCrEUe3mJoaVrAfPk4HYAg&bvm=bv.48293060,d.bmk&psig=AFQjCNG913GoZi5YQJOJL3xHDL2BdYipHA&ust=1371896576951487


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Potential energy

o Potential energy is stored in an object

because of its position or condition.

o Potential energy is stored in objects which

are:

(i) Compressed

(ii) Stretched

(iii) Raised from its position

oA compressed spring or stretched spring

has potential energy because of its

condition.


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oA durian on a tree has potential energybecause of its position.

o The greater the compression or stretch,

the greater its potential energy.o The higher an object is raised, the

greater its potential energy. The greater

the mass of the raised object, the greater

its potential energy.


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Mechanical energyo Mechanical energy is thetotal of potential

energy and kinetic energy possessed by

an object.oAn object possesses mechanical energy

because its position is changing.

o Examples of objects which have mechanicalenergy:

(i) A swinging pendulum

(ii) A see-saw in use


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A swinging pendulum has mechanical energy

No kineticenergy

Maximum

potential

energy

No potential

energy

Maximum

kinetic

energy

No kineticenergy

Maximum

potential

energy
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bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843http://www.google.com.my/url?sa=i&rct=j&q=energy%20pendulum&source=images&cd=&cad=rja&docid=TSAzpMSPCGizYM&tbnid=Knpbf3HbRz5G4M:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/explaining_motion/energychangesrev5.shtml&ei=KHbEUcH8GpDIrQfb-4GYDg&bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843http://www.google.com.my/url?sa=i&rct=j&q=energy%20pendulum&source=images&cd=&cad=rja&docid=TSAzpMSPCGizYM&tbnid=Knpbf3HbRz5G4M:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/explaining_motion/energychangesrev5.shtml&ei=KHbEUcH8GpDIrQfb-4GYDg&bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843http://www.google.com.my/url?sa=i&rct=j&q=energy%20pendulum&source=images&cd=&cad=rja&docid=TSAzpMSPCGizYM&tbnid=Knpbf3HbRz5G4M:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/explaining_motion/energychangesrev5.shtml&ei=KHbEUcH8GpDIrQfb-4GYDg&bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843http://www.google.com.my/url?sa=i&rct=j&q=energy%20pendulum&source=images&cd=&cad=rja&docid=TSAzpMSPCGizYM&tbnid=Knpbf3HbRz5G4M:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/explaining_motion/energychangesrev5.shtml&ei=KHbEUcH8GpDIrQfb-4GYDg&bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843http://www.google.com.my/url?sa=i&rct=j&q=energy%20pendulum&source=images&cd=&cad=rja&docid=TSAzpMSPCGizYM&tbnid=Knpbf3HbRz5G4M:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/explaining_motion/energychangesrev5.shtml&ei=KHbEUcH8GpDIrQfb-4GYDg&bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843http://www.google.com.my/url?sa=i&rct=j&q=energy%20pendulum&source=images&cd=&cad=rja&docid=TSAzpMSPCGizYM&tbnid=Knpbf3HbRz5G4M:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/explaining_motion/energychangesrev5.shtml&ei=KHbEUcH8GpDIrQfb-4GYDg&bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843http://www.google.com.my/url?sa=i&rct=j&q=energy%20pendulum&source=images&cd=&cad=rja&docid=TSAzpMSPCGizYM&tbnid=Knpbf3HbRz5G4M:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/explaining_motion/energychangesrev5.shtml&ei=KHbEUcH8GpDIrQfb-4GYDg&bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843http://www.google.com.my/url?sa=i&rct=j&q=energy%20pendulum&source=images&cd=&cad=rja&docid=TSAzpMSPCGizYM&tbnid=Knpbf3HbRz5G4M:&ved=0CAUQjRw&url=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/explaining_motion/energychangesrev5.shtml&ei=KHbEUcH8GpDIrQfb-4GYDg&bvm=bv.48293060,d.bmk&psig=AFQjCNHHoIuxprLXvKNdg2dH8tUvq6HrZw&ust=1371916194717843


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Chemical energy

o Chemical energy is stored in substancesthat can burn or can change chemically.

o Chemical energy is stored in foods and fuels

such as oil, coal, wood and petrol.o Chemical energy is changed to other types

of energy. Examples:

(i) Heat and light energy from a burning

candle

(ii) Sound energy from an exploding fire

cracker

(iii) Electrical energy from a battery


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Nasi lemak has chemical energy Coal has chemical energy
http://www.google.com.my/url?sa=i&rct=j&q=coal&source=images&cd=&cad=rja&docid=eg0hKkGAimeRwM&tbnid=J6MHGRzIO7sGyM:&ved=0CAUQjRw&url=http://www.climateshifts.org/?m=201009&ei=d47EUezAA43JrAeHpoHIBg&bvm=bv.48293060,d.bmk&psig=AFQjCNGn4LKsf5gWaOxr5tQaF-iua1u7eA&ust=1371922255815666http://www.google.com.my/url?sa=i&rct=j&q=chemical+energy+nasi+lemak&source=images&cd=&cad=rja&docid=DF1LFPdSQBHxCM&tbnid=Mck2TKgD3l1w2M:&ved=0CAUQjRw&url=http://eastizeast.wordpress.com/category/food/&ei=7ozEUaerPMuErAfq1YD4Dg&bvm=bv.48293060,d.bmk&psig=AFQjCNERFHeJxbOoku2XZccgKU5cgytVJA&ust=1371922023083017


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Nuclear energyo Nuclear energy is produced by:

(i) Nuclear fission

- Atoms of radioactive substances splits(ii) Nuclear fusion

- Atoms combined together in the Suns

core(iii) Nuclear energy is used in some nuclear

power stations to generate electrical

energy.


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Nuclear fission and nuclear fusion produce nuclear energy
http://www.google.com.my/url?sa=i&rct=j&q=&source=images&cd=&cad=rja&docid=X5btDI7MtIOJ1M&tbnid=di3uAjVB5xZLeM:&ved=0CAUQjRw&url=http://someinterestingfacts.net/nuclear-fission-vs-fusion/&ei=8J7EUbykC5GzrAevhoH4Cw&bvm=bv.48293060,d.bmk&psig=AFQjCNGxmufTYoEvlCzy8HfTqolV-u0NwA&ust=1371926560188193


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Sourcesof energy

Sun

Water

Fossil fuels

Biomass

Wind

Geothermal

Radioactivesubstances


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Sun

o The Sun is the primary source of energy.

This is because all life on Earth depends

on the Sun for energy. Light energy from

the Sun is used for photosynthesisin

plants to make food. Without plants, no

human beings or animals will live.

o Other sources of energy such as wind,water, fossil fuels and biomass are derived

from the Sun indirectly.


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o

Solar cells and solar panels absorb lightenergy and convert it into electrical

energy. Solar cells are used in calculators

whereas solar panels are used in satellites.

o Solar heatersabsorb heat energy from the

Sun to heat water. Solar cookers absorb

heat energy from the Sun to cook.


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Solar cells are used in calculators Solar panels are used in satellites
http://www.google.com.my/url?sa=i&rct=j&q=solar+panel+satellite&source=images&cd=&cad=rja&docid=OEUKkYtYvjcGuM&tbnid=fPFm8wLUGSIA9M:&ved=0CAUQjRw&url=http://www.turbosquid.com/3d-models/3d-model-satellite-solar-panels/512566&ei=0EnFUfqmM8bmrAeonYHIDw&bvm=bv.48293060,d.bmk&psig=AFQjCNERQO0NRiM9gKf7GiPdr4UvaOotIg&ust=1371970371673112http://www.google.com.my/url?sa=i&rct=j&q=solar+cell+calculator&source=images&cd=&cad=rja&docid=E2HW2cGSN0UybM&tbnid=YMAdseUDCOORkM:&ved=0CAUQjRw&url=http://www.solarcellideas.com/2013/01/calculator-solar-cell.html&ei=gEnFUbXxBM7arAem9YA4&bvm=bv.48293060,d.bmk&psig=AFQjCNGlnj6E9LbNxacERHE3hMqvK0aTWg&ust=1371970275314878


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Solar heaters are used to heat water Solar cookers are used to cook
http://www.google.com.my/url?sa=i&rct=j&q=solar+cooker&source=images&cd=&cad=rja&docid=TuakZPSH7AHzBM&tbnid=M_Fabnk_MLMhEM:&ved=0CAUQjRw&url=http://self-sufficient-blog.com/archives/679&ei=y0vFUfyuLoLprAfH6IGAAg&psig=AFQjCNF77eg0kZOzHXW8UcUNf3K6HvroNA&ust=1371970416887878http://www.google.com.my/url?sa=i&rct=j&q=solar+heater&source=images&cd=&cad=rja&docid=JxYwrfO79R0QHM&tbnid=7zzEOZlLQ4LwzM:&ved=0CAUQjRw&url=http://www.solartubecompany.co.uk/solar-water-heating/&ei=o0jFUbyhCMTrrQe1k4HoBA&bvm=bv.48293060,d.bmk&psig=AFQjCNEXCcBk0hj8oDVywrPC5jbpcArBmA&ust=1371970063850032


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Video on solar cooker:


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Light energyfrom the Sun

Electrical energy


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Light

energyfrom the

Sun

Photosynthesis

Plants andanimals

Deadanimals

and plants

Fossilfuels


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Heatenergyfrom the

Sun

Watervapour

Cloud

RainWater


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Heatenergy

from theSun

Unevenheating of

theEarths

surface

Wind


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Watero The heat energy from the Sun heats up

water. The water evaporates and forms

water vapour.

o The water vapour enters the atmosphere.

As it cools, it changes into water droplets

(cloud).o Water falls to the Earths surface as rain.

o Water is used to generate electrical energy

in a hydroelectric power station.


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Fossil fuelso Fossil fuels consist of coal, petroleum and

natural gas.

o

Fossil fuels are formed form dead animalsand plants buried at the bottom of the sea

millions of years ago.

o Fossil fuels provide heat energy to generate

electrical energy.


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o

Coal is used in steam engine to movetrains. Natural gas is used for cooking.

Petroleum contains many types of fuels such

as petrol, kerosene and diesel.

Formation of fossil fuels
http://www.google.com.my/url?sa=i&rct=j&q=&source=images&cd=&cad=rja&docid=1qEOxiDzTfi0bM&tbnid=EE5aaCxy6NiPjM:&ved=0CAUQjRw&url=http://www.green-planet-solar-energy.com/fossil-fuel-formation.html&ei=n8TFUZDnAcGHrgfU1ICoDA&bvm=bv.48293060,d.bmk&psig=AFQjCNER0vL3rafktBE8XkQ-ipajSkNF9w&ust=1372001763323358


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Biomasso Biomass are plant and animal materials

that can be used as fuels.

o

Energy from biomass can be obtained byburning them and decomposingthem

using bacteria.

o In India, dried cow dung is burnt as a fuel.

o In Malaysia, oil palm materials are

decomposedin tanks by bacteria to

produce methane gas which can be used

as fuel.


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o

In Brazil, sugar cane juice is fermented toproduce alcohol for use as fuel in

vehicles.


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Video on cow dung used as fuel:


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Wind

o Winds are caused by the uneven heating

of the Earths surface by the Sun. This

causes air to move from a cooler place to

a warmerplace, producing a wind.o Wind is used to:

(i) Move sailing ships

(ii) Turn windmills to grind corn and pump

water

(iii) Turn wind turbines to generate

electrical ener


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Wind is used to turn wind turbine toproduce electrical energy Wind is used to move sailing ship
http://www.google.com.my/url?sa=i&rct=j&q=sailing+boat&source=images&cd=&docid=2tuC1jvoc0gRrM&tbnid=JnSpuK3WgC6jNM:&ved=0CAUQjRw&url=http://www.elan-yachts.com/&ei=AdPFUaDeBojMrQe2y4G4BQ&psig=AFQjCNEj1Tl5F_5J47CBQx0n_XuSLVMxpw&ust=1372005463990631http://www.google.com.my/url?sa=i&rct=j&q=wind+turbine&source=images&cd=&docid=qNSihuSPyVomhM&tbnid=rSnwUkgnOdgthM:&ved=0CAUQjRw&url=http://www.greenretreat.org/bigger-better-wind-turbines/&ei=Q9LFUcDfBJCzrAf844DQCA&psig=AFQjCNHUzF3WueuZBOqY_uHe0Jf0jOIRKg&ust=1372005256078484


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Geothermalo Geothermal is the heat energy from the

core of the Earth.

o

Hot springs, geysers and volcaniceruptions are caused by geothermal

energy.

o Geothermal energy is used to produce

steam. This steam is used to rotate

generators to produce electrical energy.


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Geothermal energy is used to produce steam that turns generators toproduce electrical energy
http://www.google.com.my/url?sa=i&rct=j&q=&source=images&cd=&cad=rja&docid=53QruB0ckbRBZM&tbnid=gxdb1RRrGIvVIM:&ved=0CAUQjRw&url=http://4bs-energysources.wikispaces.com/Geothermal+Energy&ei=ytrFUaqjA4HorQeStoGACA&bvm=bv.48293060,d.bmk&psig=AFQjCNGc-G_lsKMu8XoaERF_AczMsruAhA&ust=1372006918790505


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Video on geyser:


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Radioactive substanceso Radioactive substances are used to

produce nuclear energy. Examples of

radioactive substances are uranium andplutonium.

o Nuclear energy is used to heat water to

steam to produce electrical energy.


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Atoms ofradioactivesubstance

splits

Nuclearenergy

Water isheatedby the

nuclear

energy

Steam isproduced

Steamrotatesturbine andgenerator

Electricalenergy isproduced


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o The principle of energy conservation statesthat:

(i) Energy cannot be created or destroyed

(ii) Energy can be changed from one formto another

o When a toy car is wound up, kinetic

energy is changed into potential energy.This potential energy is stored in the coil.

Kinetic energy Potential energy


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o When the toy car moves, thepotentialenergy is changed back to kinetic energy.

o Other examples of energy changes:(i) Lighted candle

(ii) Electric kettle

Potential energy Kinetic energy

Chemical energyHeat energy +Light energy

Electrical energy Heat energy


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6.2 RENEWABLE AND NON-RENEWABLE ENERGY

SOURCES

o There are two types of energy sources:(i) Renewable energy sources

(ii) Non-renewable energy sources

Renewableenergy sources

Can be

replaced andwill not run out

Does not

cause pollution

Non-renewableenergy sources

Cannot be

replaced andwill run out

Cause pollution


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SOURCES

Energy sources

Renewableenergy sources

Sun

Water

Wind

Biomass

Geothermal energy

Non-renewableenergy sources

Fossil fuels

Radioactivesubstances

6 2 O G


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SOURCES

Ways toconserveenergy

Switch offelectricalappliances

when not in use

Usepublic

transport

Car- pooling

Useefficient

equipment

6 2 RENEWABLE AND NON RENEWABLE ENERGY


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SOURCES

http://www.google.com.my/url?sa=i&rct=j&q=switch%20off&source=images&cd=&cad=rja&docid=JZ3hiXcAsqwAuM&tbnid=Qot2-erRIwL8oM:&ved=0CAUQjRw&url=http://www.rapidonline.com/facilities/save-energy-switch-off-sticker-self-adhesive-vinyl-75-x-100mm-87-7322&ei=kKfGUfbDG4rqrAfejIDQAw&bvm=bv.48293060,d.bmk&psig=AFQjCNGRNUw1LyfoqblOFAZjbkRR59tEbg&ust=1372059889506306


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SOURCES

Ways toconserveenergy

Switch offelectricalappliances

when not in use

Usepublic

transport

Car- pooling

Useefficient

equipment



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SOURCES
http://www.google.com.my/url?sa=i&rct=j&q=public+transport+malaysia&source=images&cd=&cad=rja&docid=cFt6jGV26E2G7M&tbnid=GX8MAOE76XocPM:&ved=0CAUQjRw&url=http://malaysiansmustknowthetruth.blogspot.com/2012/10/proton-politics-profit-behind-public.html&ei=aqjGUbz6E4izrAe7lICYCw&bvm=bv.48293060,d.bmk&psig=AFQjCNEyCWwy8gRLZvROQSkC3NJK9485PA&ust=1372060062821539


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SOURCES

6 3 THE IMPORTANCE OF CONSERVING ENERGY
http://www.google.com.my/url?sa=i&source=images&cd=&cad=rja&docid=cL7oRyTDvcsA8M&tbnid=wWfPzp_lpRc1WM:&ved=0CAgQjRwwAA&url=http://www.clker.com/clipart-green-check-mark.html&ei=urHGUYa_BNDOrQe6w4GAAQ&psig=AFQjCNHyFBiVuWZn5RizxYXonnXfB8Kpnw&ust=1372062522153795http://www.google.com.my/url?sa=i&rct=j&q=yes+fluorescent+lamp&source=images&cd=&cad=rja&docid=iIMj4RH2K1KQxM&tbnid=phmWWr7Z8JN_CM:&ved=0CAUQjRw&url=http://www.cnlight-lighting.com/1-4-double-capped-fluorescent.html&ei=OLHGUZeODYbtrQeH-ICoBw&psig=AFQjCNHaAiWdUE9fj9HHzRBKNQ0vBYflcQ&ust=1372061912652856http://www.google.com.my/url?sa=i&rct=j&q=no+to+incandescent+light+bulb&source=images&cd=&cad=rja&docid=R9loAFif6ticnM&tbnid=sdhRWxJfMwTA2M:&ved=0CAUQjRw&url=http://www.elrst.com/tag/led/&ei=SqrGUerpOMTZrQfJ6oDACA&bvm=bv.48293060,d.bmk&psig=AFQjCNEo6XI_qaxMMrgecyE9gywZvbLK2w&ust=1372060615599281


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6.3 THE IMPORTANCE OF CONSERVING ENERGY

SOURCES

o

Our worlds population is increasing.Therefore, the demand for energy is also

increasing.

oA large part of the energy used comes from

fossil fuels which are non-renewable energy

sources. One day, they will run out.

Therefore, it is important to conserve these

energy sources.


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Sourcesofenergy [Recovered]

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