sociology questions and answers

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what effect does the waste energy from a power station have on surroundings?
heats it.
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why is a CHP station better than coal burning power station?
coal burning power station= energy wasted. CHP station= usefully heat homes.
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what is national grid?
system= cables and transformers.
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electricity locally not transmitting through national grid 7 % increase.
less energy/ power loss wasted in shorter cables.
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shower= mirror misty
water evaporates. Molecules go into the air.mirror surface cooler damp air. water molecules hit the mirror lose energy.
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shower= heated mirror not misty
mirror surface= warm. Rate of condensation reduced.
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oscillation light wave
perpendicular energy transfer.
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light off/ on
slower/ faster rotation.
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virtual image
cannot be seen on a screen. rays of light from it not pass through it.
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plastic cap
poor conductor. stops convection currents top of flask stops energy transfer by convection
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glass container
poor conductor. Reduce energy transfer by conduction.
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vacuum
stops energy transfer two wall conduction convection.
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silvered surfaces
reflect infrared. Poor emmiters of infrared.
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size of ears keep fox warm
small surface area. Reduce energy radiated from fox.
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energy transferred hot water bottom cooler water top.
water molecules gain energy move faster. molecules move apart. water becomes less dense.warm hot water rises through tank.
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energy transferred through water tank
conduction.
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water falls fastest heater is switched off.
bigger temperature difference between water and surrounding air. transfer hot water faster.
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insulating jacket hot water tank saves money.
water hot longer. heater less time. Cost jacket recovered low energy bills.
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burning fossil fuels environment.
produce carbon dioxide and nitrogen oxide contribute to global warming.
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effect of environment reduced.
remove sulphur. plant more trees. carbon capture/ storage.
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short start up time
power stations meet surges in demand.
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advantage pumped storage hydroelectric power station
store energy for later use.
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wind turbines big fluctuations energy supply.
turbines not generate at a constant rate.
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2002 and 2008 amount of electricity homes decreased
energy efficient lighting being used. increased energy cost.more people environmentally aware.
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infrared waves communication
T.V. remote controls.short range data transmission signals.optical fibre signals.
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mobile phone does not reduce sperm count
other factors involved.
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big bang theory
origin of the universe.
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CMBR
provided evidence to support big bang theory.
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star A
red shift
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star A
moving away from earth.
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star B
decrease wavelength. Moving towards earth
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Other cards in this set

Card 2

Front

why is a CHP station better than coal burning power station?

Back

coal burning power station= energy wasted. CHP station= usefully heat homes.

Card 3

Front

what is national grid?

Back

Preview of the front of card 3

Card 4

Front

electricity locally not transmitting through national grid 7 % increase.

Back

Preview of the front of card 4

Card 5

Front

shower= mirror misty

Back

Preview of the front of card 5
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