Energy Resources Flashcards

All 10 cards in this deck

Name the non-renewable energy resources available for use on Earth.

Fossil fuels (coal, oil and natural gas) and nuclear fuel.

What is a renewable energy resource?

One that is replenished as it is used, so it will not run out; e.g. wind, hydro-electricity, the tides, the Sun and bio-fuel.

True or false? A wind farm can generate electricity reliably whenever it is needed.

False. Wind turbines only generate when the wind blows, whereas a fossil-fuel or nuclear power station can generate on demand.

Give one reason why renewable sources provide an increasing fraction of the electricity supply in many countries.

Renewables will not run out and do not release carbon dioxide, while non-renewables are running out and cause pollution.

Why does burning fossil fuels contribute to global warming?

Burning them produces carbon dioxide, a greenhouse gas that traps more heat in the atmosphere.

What is the main environmental advantage of nuclear power stations?

They release no carbon dioxide while generating electricity.

What is the main environmental disadvantage of nuclear power?

Its spent fuel is radioactive waste that stays hazardous for a very long time and must be stored securely.

What are bio-fuels made from?

Plant material or animal waste, e.g. crops, wood or manure.

Why is hydro-electric power useful when demand for electricity suddenly rises?

Extra stored water can be sent through the turbines at once, so its output can be raised very quickly.

Why has UK electricity use been falling since the start of the 21st century?

Devices have become more energy-efficient, and households make more effort to save energy.