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Wildlife habitats are lost when hydroelectric dams are built.
Physics - Pros and Cons of Alternative Electricity
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Since the start of the Industrial Revolution, an ever increasing proportion of our energy has come from non-renewable sources such as oil, coal and natural gas. These fossil fuels were made millions of years ago from the remains of dead plants and sea creatures. When they are used up, it will take millions of years before any more are formed.
1 .
What is a practical disadvantage of nearly all forms of wind, water and solar powered electricity generation?
They only work during the day
They are noisy and look out of place in the environment
They need to be built at sea for safety reasons
They don't generate electricity all of the time
There will always be times when most of these alternative forms of electricity generation will not be able to produce electricity. It is an important reason why no single one could ever replace conventional power stations
2 .
Which of the following statements about the advantages and disadvantages of wind power is not true?
Wind turbines do not pollute the air when they are generating electricity and it is a renewable form of energy
The wind turbines emit (give off) dangerous microwave radiation when they are working
Compared to a power staton, they produce only small quantities of electricity but there are no fuel costs
Some people object to wind power because they feel the turbines are noisy and spoil the view
The amount of electricity generated depends on the wind speed so wind turbines are usually sited in windy areas
3 .
Geothermal energy is renewable because it uses what?
Warm winds that blow out from the Sahara Desert
The Earth's internal heat
Warm currents in the seas
Captured and stored river water
The heat comes from radioactive materials deep inside the Earth
4 .
Which of the following renewable energy resources would be the most suitable for Scotland? Its climate is generally cool, windy and very wet. There are a lot of mountains.
Tidal and wind
Wind and hydroelectric
Hydroelectric and solar cells
Solar cells and biomass
Over 10% of electricity in Scotland comes from hydroelectric power
5 .
Which of the following is a disadvantage of geothermal energy?
It is non-renewable
It produces a lot of air pollution
It only works at night
It can only be used in a few places on the Earth
Geothermal power stations can only be built in geologically active places where the hot rocks are closer to the surface than elswhere e.g. Iceland or northern Italy
6 .
Which of the following is considered to be a disadvantage of generating electricity using wind turbines?
They use a renewable energy resource
They don't produce electricity at night
They are noisy and unsightly
They can be sited out at sea
Not everyone shares this view of using wind turbines
7 .
Which of the following lists contain the missing words in the correct order?
Water power in its various forms is a _________ energy resource and there are no fuel costs. No harmful polluting ________ are produced. Tidal barrages and hydroelectric power stations are very reliable and can be started up quickly. Disadvantages of ________________ include the destruction of habitat of estuary plants and animals, including wading birds. Hydroelectric dams flood farmland and sometimes whole villages. The rotting vegetation under the stored water releases methane, which is a _____________ gas.
Water power in its various forms is a _________ energy resource and there are no fuel costs. No harmful polluting ________ are produced. Tidal barrages and hydroelectric power stations are very reliable and can be started up quickly. Disadvantages of ________________ include the destruction of habitat of estuary plants and animals, including wading birds. Hydroelectric dams flood farmland and sometimes whole villages. The rotting vegetation under the stored water releases methane, which is a _____________ gas.
renewable, gasses, tidal barrages, greenhouse
sustainable, pollutants, hydroelectric, acidic
gases, tidal barrages, greenhouse, renewable
clean, greenhouses, hydroelectric power stations, yellow
As with all forms of renewable energy sources, there are advantages and disadvantages
8 .
Which of the following is considered to be a disadvantage of producing electricity from water stored behind a dam?
Wildlife habitats and farmland are lost when the dam is built and the reservoir created
Electricity is only produced in rainy weather
Electricity has to be used to store the water
The dam creates pollution whilst it is being built
A relatively small dam can flood quite a large area of a valley, destroying land that was used for growing food or farming animals. Where the flooded land is not used for farming, wildlife habitat is lost. In some cases homes, and even complete villages, are submerged, meaning that the famileies living there have to move to new homes
9 .
Radiation from the Sun is the energy source for solar cells and solar panels. Which of the following statements is true?
Solar panels produce large amounts of electricity
Solar cells can only be used when the Sun is shining brightly
Solar cells are expensive and inefficient
Solar cells and solar panels both release greenhouse gasses when they are working
Many factors affect the efficiency of solar cells - efficiencies of less than 20% are normal
10 .
Which of the following is not an advantage of tidal energy?
Tidal energy is renewable
The tidal barrage could act as a bridge from one side of the estuary to the other
The tidal barrage could alter the ecosystems around the estuary
At very high tides the tidal barrage can be used to prevent flooding
Another disadvantage is that they only generate electricity at low tide - but on the other hand, they can be started up quickly to boost the electricity in the National Grid
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