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Collecting energy from the sun

All our energy comes from the sun (except thermal and
nuclear energy)

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At present most of our electricity is made by burning
fossil fuels but these are non-renewable so other sources
have to be found

In hot under developed countries, LEDC's, the sun can be
used directly to provide energy for cooking food




In western, MEDC's, world
technology has been developed to…

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Solar cells




The power of the solar cell is dependent:

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The intensity of the light
How close the light is

Advantages Disadvantages
They are easy to maintain Don't work at night
They do not need power cables so they Don't work in bad
can be used in remote locations weather
They do not use fuel as they use a Look…

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Again only works when the sun is shining or during the day




Wind turbines




Sun causes weather
Wind turns the turbine
Kinetic (moving) energy turned into electricity

Advantages Disadvantages
Renewable Needs to be windy
Doesn't pollute Doesn't look very nice
Strong Needs space

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Types of electric currents

There are two forms of currents, a.c. and d.c.

d.c. stands for direct current which is the type of current
produced by solar cells
Direct current moves in one direction only




Direct current is produce by:
Solar cells
Batteries
Conversion units for laptops ect...

a.c. stands…

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