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Copy of renewable energy
Transcript of Copy of renewable energy
What is renewable energy ?
Renewable energy is generally defined as energy that recover fast and inexhaustible.
In addition they are more energy-efficient and is an important point of the sustainable energy policy.
Solar energy, radiant light and heat from the sun, is harnessed using a range of ever-evolving technologies such as solar heating, solar photovoltaics.
Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy.
examples of renewable energy
pros & cons
doesn't work at night
very expensive installation
require a lot of land
toxic substance inside
It reduces your electricity bills.
pollution and noise free
Electricity varies with wind speeds.
If a lot of wind is there it can produce a good amount of energy.
governments offer tax incentives to spur wind-energy development.
long recharge time
costs more up front
poor battery lifetime ( < 5 years)
small operation costs
often smaller taxes insurance
The change to renewable energies definitely poses many challenges, but these are much smaller and easier to deal with than the consequences of continue reliance on fossil fuels.
Wind power uses the energy of wind to turn a wind turbine. Wind turbines are connected to a generator
that create electricity as they turn.
First windmill were used in Babylon 3,000 years ago.
What is renewable energy
Why we need renewable energy
very important for the future
independent from other nations
Why we need renewable energy
solar and wind
oil and gas
tidal power plant
You don't need extra equipment
In the future most cars will run on electricity from sun, wind, and water. Plug-in electric vehicles will hum along streets, giving off no exhaust.
At least that’s the vision many people are hoping will become reality. But first there are a few logistical problems to work out.
main source of energy for all life
WW-Sales: 4.5 million cars
onshore, offshore, nearshore
biggest windpark is in the USA
Solar plant in kassel
biggest solar park is in spain
demand of oil is covered for the next 40 years
due to globalization we burn more and more fossil fuels
wind turbines and hydro power plants can damage the habitat of birds and fish
rain forests are cleared for energy crops
increase of food prices
expensive for households
the difficult to change our habits
the structure of power grid
storage of power
Oil and Gas imports