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Physics - Electricity from the Sun, Wind and Water (AQA)
Solar cells and wind farms are both alternative sources of power.

Physics - Electricity from the Sun, Wind and Water (AQA)

In GCSE Science students will spend some time looking at electrical energy. This is the fourth of six quizzes on that topic and it looks at how electricity can be generated from renewable resources, such as the Sun, the wind or water.

In conventional power stations, an energy source is used to heat water to make steam. The steam produced drives a turbine that is coupled to an electrical generator. Most of the energy sources create pollution and are non-renewable, and these are two big disadvantages.

Scientists and engineers have developed other ways of generating electricity from renewable and non-polluting energy sources. Water and wind can be used to drive turbines connected to generators and electricity can also be produced directly from the Sun's radiation. In some areas of the world, for example Iceland, volcanic activity creates hot water and steam. The steam can be piped to the surface of the earth where it can be used to drive turbines connected to generators.

What is the name given to the source of energy created by the burning of gas from decaying plant or animal waste?
Not only is this a renewable energy resource, it also gets rid of waste in a useful way
Where does the energy for tidal power stations come from?
Other power stations
The gravitational attraction of the Sun and Moon
The wind
Ships passing by and creating waves
The tides are created by the gravitational attraction of the Sun and Moon on the oceans of the Earth. There is a high tide once every 12 hours
Choose the answer that contains the missing words in the correct order.

Convection _________ in the Earth's atmosphere give rise to the wind. These are created by ______ energy from the Sun warming up the surface of the Earth. Wind _________ have large blades that are connected to gears linked to a __________. The _________ energy of the wind is transferred into electrical energy.
cells, generator, turbines, heat, turning
circles, kinetic, turbines, generator, electrical
currents, heat, turbines, generator, kinetic
currents, light, generators, dynamo, chemical
Wind power can be traced back to the Sun and it is for that reason it is a renewable source of energy
Which energy source comes from the movement of sea water flowing through turbines to generate electricity?
Tidal power
Hydroelectric power
Wave power
Geothermal power
At high tide the dam is closed, trapping the water behind it. At low tide it is opened and the water behind the dam can flow back to the sea through the turbines, generating electricity
What term is used to describe energy resources that will always be available?
At some point in the future, fossil fuel supplies will be used up. They took millions of years to form and humans will have used them all up in a few hundred years
Which system generates electricity directly from the Sun's radiation?
Hydroelectric power
Solar panels
Tidal power
Photovoltaic cells
This is another name for solar cells. It is easy to confuse solar cells with solar panels which produce hot water and not electricity
In photovoltaic cells on what does the amount of electricity produced depend??
The amount of electricity produced depends only on the light intensity
The amount of electricity produced depends only on the size of the photovoltaic cell
The amount of electricity produced depends on both the light intensity and size of the photovoltaic cell
The amount of electricity produced is the same whatever the light intensity and size of the photovoltaic cell
The brighter the light and the larger the cell, the more electricity is produced
Which of the following would be a good source of electrical energy for a remote place?
A roof made from solar cells
A wind turbine
A hydroelectric system
All of the above
These are all good ways of providing electricity for remote locations. It is always best if several methods are used together so that there will always be electricity generated
Which of the following describes the energy changes in a pumped storage hydroelectric system?
potential → kinetic → electrical
electrical → kinetic → potential → kinetic → electrical
chemical → potential → kinetic → electrical
chemical → potential → electrical → kinetic → electrical
Water is pumped to a higher reservoir using off-peak electricity that would otherwise be unused. The water can then be released at peak times to be sent through the national grid
Geothermal energy is obtained by using steam that comes from under the ground. Where does the heat energy come from that creates the steam?
From the Sun heating the ground
From fossil fuels that have been set alight by volcanoes underground
From radioactive decay deep inside the Earth
From earthquakes
As you go deeper into the Earth the the rocks get hotter. This heat comes from the decay of radioactive minerals deep inside the Earth
You can find more about this topic by visiting BBC Bitesize - Electricity

Author:  Kev Woodward

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