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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
harness energy from the sun
Solar panels
Black pipes absorb energy to heat water running through
them, but large, inefficient and only works in the sunshine…read more

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Solar cells
The power of the solar cell is dependent:…read more

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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 ugly
renewable energy resource
They are strong and last a long time
They do not pollute the environment
They are free once they are installed
Glass panels (the greenhouse effect)
The greenhouse effect can be…read more

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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…read more

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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
Conversion units for laptops ect...
a.c.…read more


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