Home > Science > AQA Science Topics > Mains electricity > Generating electricity
Why are coal, oil and natural gas non-renewable resources?
They contain carbon compounds.
They cannot be replaced, except over millions of years.
Once used, they cannot be used again.
For a given amount of energy released, which fuel releases the most carbon dioxide?
Which type of power station takes the least time to start up?
Gas-fired power station
Nuclear power station
Coal-fired power station
What problem does sulfur dioxide cause?
It contributes to global warming.
It harms the ozone layer.
It contributes to acid rain.
Why are uranium and plutonium used as nuclear fuels?
They are metals.
They release a lot of heat when they burn.
They are radioactive.
Which of the following is an advantage of nuclear fuels?
They are renewable energy resources.
They do not emit harmful radiation.
They do not produce greenhouse gases.
Which of the following is considered a disadvantage of wind farms?
They use a renewable energy resource.
They are noisy and unsightly.
They do not produce electricity at night.
Which of the following is a disadvantage of hydroelectric power produced by using a dam?
The power station only works when the tide comes in.
River valleys and farmland are flooded by the dam.
The power station only works on rainy days.
Where does the heat energy for geothermal energy resources come from?
From radioactive decay in rocks
From hot water and steam in the power station
From the Sun warming the ground
Which of the following is a disadvantage of solar cells?
They can supply electricity in remote areas.
They need complex moving parts.