Solar Energy
What is solar energy?
Solar energy is light or heat (radiant energy) that comes
from the sun.
Although solar energy is the most abundant energy source
available, harnessing the energy effectively can be
problematic.
In 2008, solar only provided 0.02% of the world’s energy.
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Solar or photovoltaic cells are made using silicon which is heated and melted at high temperatures and then formed into wafers.
Solar Cells
When sunlight hits the solar panel, electrons are loosened and solar energy is converted into electrical energy.
Solar Power
Solar ThermalSolar thermal plants use the
sun’s rays to heat liquid, which then is used to heat the water
and produce steam.
The steam can then be used to drive a turbine and generate
electricity.
The sun has traditionally been and is still used for heating,
cooking, etc.
Pros
the sun is free!
storage systems can be used to collect the sun’s energy
manufacturing solar cells produces up to 300 times less toxic emissions that coal power plants
pollution-free when operating
Cons
solar cells take up large amounts of space
solar cells are difficult and expensive to make
the sun does not deliver that much energy to any one place for too long and is not always out
requires lead and mercury in the manufacturing