Flashcards
Physics 1 (Chapter 4)
Flashcards do conjunto (23)
- 1Biofuels-They are renewable sources of energy
-Biofuels such as Methane and Ethanol can be used to generate electricity - 2What fuels are used in Nuclear power stations and what fuels are used in Fossil fuel power stations?Nuclear power stations= Uranium or Plutonium
Fossil fuel power stations= Coal, oil or gas - 3Do nuclear power stations release greenhouse gases? Explain your answer.No, because uranium releases energy without burning
- 4Do fossil fuel power stations release greenhouse gases? Explain your answer.Yes, because fossil fuels produce gases such as carbon dioxide when they burn
- 5How do coal/oil/gas-fired power stations work?-The burning fuel heats water in a boiler
-This produces steam
-The steam drives a turbine that turns an electricity generator - 6Fossil fuelsFuels which are obtained from long-dead biological material
(example of fossil fuels would be coal, oil or gas) - 7Wind turbineAn electricity generator at the top of a tall tower
- 8How are hydroelectricity generators turned?By water running downhill
- 9Tidal power stationsTidal power stations trap each high tide and then use it to turn generators
- 10a)_____ power does not need water. b)_____ power does not need energy from the sun. c)_____ power is obtained from water running downhill. d)_____ power is obtained from water moving up and down.a) Wind
b) Waves
c) Hydroelectricity
d) Tidal - 11Solar cellsSolar cells are flat solid cells that convert solar energy directly into electricity
- 12Geothermal energyThis energy comes from energy released by radioactive substances deep within the Earth.
- 13Solar heating panelsThese panels use the Sun's energy to heat water directly
- 14What does water being pumped into hot rocks underground produce?It produces steam to drive turbines that generate electricity
- 15What do nuclear fuels produce?Radioactive waste
- 16Nuclear power ~Advantages~-No greenhouse gases (unlike fossil fuel)
-Much more energy from each kilogram of uranium (or plutonium) fuel than from fossil fuel - 17Nuclear power ~Disadvantages~-Used fuel rods contain radioactive waste, which has to be stored safely for centuries
-Nuclear reactors are safe in normal operation, However, an explosion at one could release radioactive material over a wide area. This would affect these areas for many years. - 18Renewable energy sources and the environment ~Advantages~-They will never run out
-They do not produce greenhouse gases or acid rain
-They do not contain radioactive waste products - 19Renewable energy sources and the environment ~Disadvantages~-Wind turbines create a whining noise which can upset people nearby and some people may consider them unsightly
-Tidal barrages affect river estuaries and the habitats of creatures and plants there
-Hydroelectric schemes need large reservoirs of water, which can affect nearby plant and animal life. Habitats are often flooded to create dams
-Solar cells would need to cover large areas to generate large amounts of power - 20The National GridThis is a network of cables and transformers that distributes electricity to our homes from distant power stations and renewable energy generators
- 21What does a high grid voltage do?A high grid voltage reduces energy loss and makes the system more efficient
- 22What are Step-up transformers used for?They are used to step up power station voltages to the grid voltage
- 23What are Step-down transformers used for?They are used to step the grid voltage down for use in our homes
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- GCSE Science FlashCards sobre Physics 1 (Chapter 4), criado por gizmoalex123 em 15-11-2015.
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