P1 - Topic 5 - Using Renewable energy resources Flashcards

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1
Q

disadvantage of hydroelectricity?

A

big impact on environment due to flooding of the valley = loss of habitat for some species

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2
Q

advantage of hydroelectricity?

A

an immediate response to increased electricity demand - more water let out through turbine to generate more

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3
Q

what is the costing of hydroelectricity like?

A

high initial cost it there are minimal running costs and reliable

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4
Q

what is wave power?

A

-up and down motion of waves is used to drive a generator

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5
Q

advantages of wave power?

A
  • offshore wave farms are now being developed to make us of waves further out in the ocean creating more energy
  • useful on small islands
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6
Q

disadvantages of wave power?

A
  • unreliable = waves die down when wind drops
  • most wave power used waves close to shore which have less power
  • never likely to provide energy on a large scale
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7
Q

what are tidal barrages?

A
  • big dams built across river estuaries with turbines in
  • tide comes in = estuary fills up
  • water then let out through turbines at controlled speed
  • drives turbine on the way
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8
Q

advantages of tidal barrages?

A

reliable energy source = potential to generate lots of energy

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9
Q

disadvantages of tidal barrages?

A

can only be used in a few of the most suitable estuaries

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10
Q

what is wind power?

A
  • wind turbines have own generators inside = electricity generated directly from the wind turning blades which turns generator
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11
Q

advantages of wind power?

A

no pollution (expect manufacturer ion)

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12
Q

advantages of wind power?

A

spoil view
can be very noisy
not work when windy = unreliable
not always possible to supply more electricity when there’s extra demand

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13
Q

what are solar cells?

A

generate electric current directly from sun

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14
Q

disadvantages of solar cells?

A

relatively small scale (homes)

not as good in cloudy countries but still cost efficient

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15
Q

advantages of solar cells

A

reliable In sunny countries

good for remote places where there isn’t many ways to generate electricity

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16
Q

what is geothermal energy?

A
  • place with hot rocks near to surface
  • source of heat = slow decay of radioactive material
  • water pumped in pumps down to hot rocks
  • return as steam to drive a generator
17
Q

advantages of geothermal energy?

A
  • ‘free’ energy
  • no real environmental problems
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18
Q

disadvantages of geothermal energy?

A
  • high set up costs

- very few places where it is an economic option

19
Q

what is biomass energy?

A
  • waste material (animal waste, landfill rubbish etc) burnt in power stations to drive turbines and produce electricity
20
Q

advantages of biomass energy?

A

plants that grew to produce the waste would’ve absorbed co2 from atmosphere

21
Q

disadvantages of biomass energy?

A

when waste burnt co2 is released so there is no actual effect on co2 levels = carbon neutral

22
Q

what is hydroelectricity?

A
  • flooding a volley by building a big dam

- rainwater caught and allowed through turbines