GCSE Geography | Hydroelectric power, dam building energy, hydrological cycle

Geography Quiz - Hydroelectric Power (Questions)

Hydroelectric power uses flowing water to generate electricity. This GCSE Geography quiz explores how HEP schemes work, their advantages, and their impacts on people and the environment.

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Fascinating Fact:

Once built, hydroelectric power stations produce very low greenhouse gas emissions during operation compared with fossil fuel power stations.

In GCSE Geography, the Hydroelectric Power topic looks at how dams, reservoirs and turbines turn the energy of falling water into electricity. You explore different HEP case studies, weighing up economic benefits, social impacts and environmental costs, including flooding valleys, changing river flow and affecting wildlife habitats.

Key Terms

Hydroelectric power (HEP): Electricity generated by using moving or falling water to drive turbines connected to generators.
Reservoir: An artificial lake, usually formed behind a dam, that stores water for hydroelectric power and other uses.
Turbine: A machine with blades that spin when water flows past, turning kinetic energy into mechanical energy for electricity generation.

Frequently Asked Questions (Click to see answers)

What is hydroelectric power in GCSE Geography?

Hydroelectric power is electricity produced from the movement of water. In GCSE Geography, it is studied as a renewable energy source that uses dams, reservoirs and turbines to generate power.

What are the main advantages of hydroelectric power?

Hydroelectric power produces very low emissions during operation, can respond quickly to changes in demand, and reservoirs can also provide water supply, flood control and recreation for local communities.

What environmental impacts do hydroelectric dams have?

Hydroelectric dams can flood valleys, destroy habitats, block fish migration and change river flow downstream. Careful planning and management are needed to reduce these environmental impacts.

Try These Related Quizzes

Which of the following statements about hydroelectric power is true?

[ ]	It is a renewable source of energy
[ ]	It is very cheap and easy to set up
[ ]	It is a non-renewable source of energy
[ ]	Hydroelectric schemes are never built in mountainous areas

Where does the electricity from most hydroelectric schemes go?

[ ]	Directly to nearby towns
[ ]	Only to local homes
[ ]	Into the National Grid
[ ]	Only to factories that produce aluminium

Which of the following is an environmental problem that is associated with hydroelectric power?

[ ]	Greenhouse gas emission during electricity generation
[ ]	Carbon particles entering the atmosphere
[ ]	Building access roads to construct the dam
[ ]	Acid rain

Which of the following is not a valid socio-economic disadvantage of building a large hydroelectric scheme in the mountains of Scotland?

[ ]	Farming land is flooded
[ ]	People need to be re-housed because their homes will be flooded by the new reservoir
[ ]	Transportation of materials to the construction site
[ ]	Shopkeepers will have fewer customers

Which of the following is a good reason for building a hydroelectric power dam?

[ ]	It creates a water reserve as well as generating electricity
[ ]	This form of electricity generation does not produce greenhouse gases
[ ]	This form of electricity generation does not produce acidic gases
[ ]	All of the above

What is the name of the device that turns the generators to make electricity?

[ ]	A turbot
[ ]	A tube
[ ]	A turban
[ ]	A turbine

Why are hydroelectric power schemes usually sited in the upper course of rivers?

[ ]	Greater rainfall
[ ]	Wider and deeper valleys than lower down
[ ]	In order to avoid environmental damage
[ ]	It is a lot cheaper

In China, the Three Gorges Dam on the Yangtze river is the largest hydroelectric power station in the world and caused great controversy before it was built. Which of the following is the least likely to be a reason that some people did not want it to be built?

[ ]	Some important archaeological and cultural sites would be destroyed
[ ]	Over a million people would need to be re-homed
[ ]	It could reduce greenhouse gas emissions by about one hundred million tonnes in a year
[ ]	Destruction of habitat critical to some highly-endangered species

Although hydroelectric dams flood large areas of the countryside, reducing the amount of farmland, they can also bring long-term economic benefits to the local economy. How?

[ ]	Tourism
[ ]	Heavy industry is attracted by cheap and plentiful electricity
[ ]	Forestry
[ ]	Construction jobs

10.

Hydroelectric dams can be used to control ...

[ ]	the army
[ ]	the flow of water upstream from the dam
[ ]	the flow of water downstream from the dam
[ ]	the population of an environmentally-sensitive area

Geography Quiz - Hydroelectric Power (Answers)

Which of the following statements about hydroelectric power is true?

[x]	It is a renewable source of energy
[ ]	It is very cheap and easy to set up
[ ]	It is a non-renewable source of energy
[ ]	Hydroelectric schemes are never built in mountainous areas

Hydroelectric scheme dams are expensive to build. Water is a renewable resource and mountainous areas are excellent places for hydroelectric schemes

Where does the electricity from most hydroelectric schemes go?

[ ]	Directly to nearby towns
[ ]	Only to local homes
[x]	Into the National Grid
[ ]	Only to factories that produce aluminium

Hydroelectric power stations can be started up very quickly to put extra electricity into the National Grid when electricity demand is high

Which of the following is an environmental problem that is associated with hydroelectric power?

[ ]	Greenhouse gas emission during electricity generation
[ ]	Carbon particles entering the atmosphere
[x]	Building access roads to construct the dam
[ ]	Acid rain

The access roads require aggregates which has to be quarried and transported to make the road. The road destroys wildlife habitat and can disturb the flow of surface water

Which of the following is not a valid socio-economic disadvantage of building a large hydroelectric scheme in the mountains of Scotland?

[ ]	Farming land is flooded
[ ]	People need to be re-housed because their homes will be flooded by the new reservoir
[ ]	Transportation of materials to the construction site
[x]	Shopkeepers will have fewer customers

When farmland is flooded, farmers need compensation for their loss of income. Where communities are lost because they will be underwater when the dam is full, the people need to be given new homes to live in. Getting the materials to a remote mountain location is costly

Which of the following is a good reason for building a hydroelectric power dam?

[ ]	It creates a water reserve as well as generating electricity
[ ]	This form of electricity generation does not produce greenhouse gases
[ ]	This form of electricity generation does not produce acidic gases
[x]	All of the above

No fuel is burnt to generate the electricity so no polluting gases are emitted

What is the name of the device that turns the generators to make electricity?

[ ]	A turbot
[ ]	A tube
[ ]	A turban
[x]	A turbine

This is linked to a generator via a gearbox

Why are hydroelectric power schemes usually sited in the upper course of rivers?

[x]	Greater rainfall
[ ]	Wider and deeper valleys than lower down
[ ]	In order to avoid environmental damage
[ ]	It is a lot cheaper

There are other reasons too like the narrow deep valleys mean that narrow dams can store a lot of water but are cheaper to build

[ ]	Some important archaeological and cultural sites would be destroyed
[ ]	Over a million people would need to be re-homed
[x]	It could reduce greenhouse gas emissions by about one hundred million tonnes in a year
[ ]	Destruction of habitat critical to some highly-endangered species

The building of the dam has lead to the extinction of a river dolphin that was only found in the Yangtze