renewable energy kristin friedemann marit kalda. what is renewable energy? wind power hydro power...
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Renewable energy
Kristin Friedemann
Marit Kalda
![Page 2: Renewable energy Kristin Friedemann Marit Kalda. What is renewable energy? Wind power Hydro power Sun energy Tidal energy](https://reader036.vdocuments.net/reader036/viewer/2022062421/56649cec5503460f949b8127/html5/thumbnails/2.jpg)
• What is renewable energy?
• Wind power
• Hydro power
• Sun energy
• Tidal energy
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What is renewable energy?
• Renewable energy effectively uses natural resources such as sunlight, wind, water, tides and geothermal heat, which are naturally replenished.
• Renewable energy is environmentally friendly and is not harmful to the nature. When we use renewable energy then it does not pollute as with using fossil fuels for energy.
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Wind power• Wind power is the conversion of wind energy into useful
form, such as electricity, using wind turbines.
• The turbines have to be put in windy places such as the seaside.
• The pros are: cheap, friendly to the environment, can be used effectively, there is more than enough of „fuel“ and it is free.
• The cons are: they disturb birds and bats, the turbines make noise, vibration and moving shadows.
• In Estonia wind power is being used more and more, because we have an endless supply of wind. We have already many wind parks for example Pakri wind park.
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Wind turbines
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Hydro power
• Hydro power uses flowing water to generate electricity. Hydro power stations are built on large rivers.
• The pros are: environmentally friendly, effective.
• The cons are: harms the fish, makes noise, costs a lot.
• In Estonia we have some hydro power stations, for example Keila-Joa hydro power station, but they are small because we have only small rivers.
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Hydro power station
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Sun energy• Solar energy is energy from the Sun in the form of heat
and light. • There are three main ways that we use the Sun's
energy : 1) Solar Cells 2)Solar water heating 3)Solar Furnaces • Solar energy is free - it needs no fuel and produces no
waste or pollution. • In sunny countries, solar power can be used where there is no easy way to get electricity to a remote place. • Doesn't work at night. • Very expensive to build solar power stations.Solar cells cost a great deal compared to the amount of electricity they'll produce in their lifetime.
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Tidal power
• Energy from the sea - The tide moves a huge amount of water twice each day .
• converting it into useful electrical power is not easy • It produces no greenhouse gases or other waste. • It needs no fuel.
• Only provides power for around 10 hours each day,
when the tide is actually moving in or out. • Only works when tide is going in or out • around 20 sites in the world have been
identified as possible tidal power stations.
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