chapter 12 using electricity wisely my pals are here! science 5b © 2003 times media private limited...
TRANSCRIPT
Chapter 12Chapter 12
Using Electricity Using Electricity WiselyWisely
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We have to pay for the electricity we use.
Can you guess where electricity comes from?My Pals are Here! Science 5B My Pals are Here! Science 5B © 2003 Times Media Private Limited© 2003 Times Media Private Limited
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How electricity is produced in a power stationHow electricity is produced in a power station
1) Oil, coal and natural gas are burnt to boil water.
2) Steam is produced. 3) Steam turns the turbine.
4) The turbine is connected to a generator. As the turbine turns, the generator spins and produces electricity.
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turbine
generator
boiler
steam
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First Video
http://www.youtube.com/watch?v=A88GavnD_DQ&feature=related
Second Video
http://www.youtube.com/watch?v=ynOnaTrHS7Q&feature=related
Wind and running water can also be used to generate electricity.
windmillsdam
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Oil, coal and natural gas are natural resources that come from the Earth.
They take a long time to be formed and cannot be replaced quickly.
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The more we use them, the less we will have for the future.
It is our responsibility to use these resources carefully.
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I am leaving the room now!
Mum, I am going to read my book. You may turn the TV off.
Conserving Electrical EnergyConserving Electrical Energy
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We can use these resources carefully by conserving electrical energy.
What good habits do Joe and Sue have?
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Conserving Electrical EnergyConserving Electrical Energy
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Switch off all electrical equipment that are not in use.
Use energy-saving bulbs. These bulbs use less electricity, but produce sufficient light.
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Conserving Electrical EnergyConserving Electrical Energy
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Do not open the door of the refrigerator unnecessarily. Each time the door is opened, more electricity is needed to cool the refrigerator.
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Conserving Electrical EnergyConserving Electrical Energy
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At night, sleep with the lights off. If you really need to have some light, use a small lamp.
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Conserving Electrical EnergyConserving Electrical Energy
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rice cooker
kettle
microwave oven
timer
Use electrical equipment that switch off automatically.
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By conserving electricity, oil, coal and natural gas
resources can last longer!
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Not only that, your family saves
money too!
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At a glance…At a glance…
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Electricity is produced by generators in power stations.
Oil, coal and natural gas are burnt to produce electricity in power stations.
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At a glance…At a glance…
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These natural resources do not last forever. We need to use them carefully so that they can last for a long time.
Conserving electrical energy can allow oil, coal and natural gas to last longer.
Using less electricity also helps save money.
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