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RENEWABLE ENERGY

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Advance English

on 19 December 2013

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Transcript of RENEWABLE ENERGY

ENERGY
What Does Renewable Energy Mean?
What Are Renewable Energies?
Renewable energy means energy that comes from
natural resources and can not be exhausted
Wind Energy
Solar Energy
Hydropower Energy
Biomass Energy
Geothermal Energy
Wind Energy
What is Energy ?
What kind of energy do we have?
What are Non-Renewable and Renewable Energy ?
Non-Renewable Energy
comes from sources that will not be replenished in our lifetimes.
These Sources
Oil and petroleum products
Natural gas
Coal
Uranium (nuclear energy)
Clean energy
From natural sources
Not harmful to the environment
-Wind turbines convert the kinetic energy in the wind into mechanical power and then a generator can convert mechanical power into electricity
Basically, wind is caused by the uneven heating of the atmosphere by the sun, variations in the earth's surface, and rotation of the earth.
Wind energy describes the process by which wind is used to generate electricity
Solar Energy
Solar energy is energy that is present in sunlight.
It has been used for thousands of years in many different
ways by people all over the world.
Heating
Cooking
Drying
It is used today to make electricity by solar cell panels
At present, solar cell panels convert, at best, about 15% of sunlight hitting them into electricity.
Solar powered electricity generation uses either photovoltaics or heat engines
Basically,
Hydropower
Energy
Did you know this?
Hydopower is the most used renewable
energy source in the US!
Since water is about 800 times denser than air
, even a slow flowing stream of water can yield considerable amounts of energy.
The energy which is derived from water in motion.
Kinetic energy of flowing water
-> Propellers of turbine ->
Electrical energy
A dam is located near a lake in
order to get energy from the water
Biomass Energy
Basically
Biomass energy
is renewable source of energy that is found in plants
Wood
Animal waste
Vegetable waste
In 2009 around 9% more electricity was generated from biomass !
Geothermal
Energy
Geothermal Energy uses heat under
the earth to make electricity.
The Earth's geothermal resources are theoretically more than adequate to supply humanity's energy needs, but only a very small fraction may be profitably exploited.
!
Geothermal energy is the heat from the Earth. It's clean and sustainable

Basically
Energy is defined as the ability or the capacity to do work.
we have renewable and non-renewable energy!
high heat in sun’s core cause Hydrogen (H) atoms to fuse to form Helium (He) atoms –
fusion of deuterium 1p + 1n and tritium (1p + 2n) into He (2p + 2n) atoms + 1n releases
heat & light energy
Fusion Reaction
Geothermal energy has been used for bathing since Paleolithic times and for space heating since ancient Roman times, but it is now better known for electricity generation
Full transcript