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What is it?
Solar energy is radiant light and heat from the Sun that is harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture, molten salt power plants and artificial photosynthesis.

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It is the use of wind to provide electrical power.
People have used wind power for more than 5500 years but for electricity it was used in 1888.

How does it work?
It works like this: the wind turbines turn the generator which produces the electricity.

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Geothermal power is power generated by the thermal energy generated by the earth.

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Biomass is plant or animal material used to produce fuel and heat.

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First geothermal powerplant opened in Croatia in 2019

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First geothermal powerplant opened in Croatia in 2019

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Turboden - 17.5 MW ORC geothermal power plant in Velika Ciglena

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It is use of falling or fast-running water to produce electricity or to power machines

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Biomass poweplant 'drvenjača' Fužine

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In the 20th century, prince Piero Ginori Conti tested the first geothermal power generator on 4 July 1904 in Larderello, Italy.

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Biomass was invented in the 70s as a way to replace fossil fuels.
(a group of scientist came up with this idea)

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Hydropower became an electricity source in the late 19th century, a few decades after British-American engineer James Francis developed the first modern water turbine. In 1882, the world's first hydroelectric power plant began operating in the United States along the Fox River in Appleton, Wisconsin. Origin of it dates even from ancient Greeks who used water wheels for grinding wheat.

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1. Hot water is pumped from deep underground through a well under high pressure.

2. When the water reaches the surface, the pressure is dropped, which causes the water to turn into steam.

3. The steam spins a turbine, which is connected to a generator that produces electricity.

4. The steam cools off in a cooling tower and condenses back to water.

5. The cooled water is pumped back into the Earth to begin the process again.

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Dubrava Hydroelectric Power Plant

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Hydropower plants capture the energy of falling water to generate electricity. A turbine converts the kinetic energy of falling water into mechanical energy. Then a generator converts the mechanical energy from the turbine into electrical energy.

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When the sun shines into a solar panel, energy from the sunlight is absorbed by the PV cells in the panel. This energy creates electrical charges that move in response to an internal electrical field in the cell, causing electricity to flow.

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Biomass in itself contains chemical energy inside realeases as heat. It can also be used to generate steam, which throughout futher processes to generate electricity.

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In 1839, French physicist Edmond Becquerel discovered the photovoltaic effect (The photovoltaic effect is the generation of voltage and electric current in a material upon exposure to light.) while experimenting with a cell. He noted that the cell produced more electricity when it was exposed to light.

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PROS:
you can lower your electric bill, improve the value of your home, reduce your carbon footprint, combat rising electricity costs, earn money back on your investment

CONS:
it doesn't work for every roof type, not ideal if you are about to move, buying panels can be expensive, lower savings, finding local solar installers can be difficult

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Drawbacks:
- drought potential
- limited reservoirs
- expensive to built
- environmental consequensces

Benefits:
- renewable
- low emissions
- safe
- reliable

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Biomass is always and widely available as a renewable source of energy.
It is carbon neutral.
It reduces the overreliance of fossil fuels.
Is less expensive than fossil fuels.
Biomass production adds a revenue source for manufacturers.
Less garbage in landfills.

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It's not as efficient s fossil fuels.
It's not entirely clean.
It can lead to deforestation.
Biomass plants require lots of space.

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What is Hydrogen fuel?
Hydrogen fuel is a zero carbon fuel burned with oxygen.

Who thought of it?
Sir William Robert Grove conceived the first hydrogen fuel cell in 1839.

How does it work?
Hydrogen combustion releases energy that enables hydrogen to work as a fuel.

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Hydropower plants in Croatia:

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The biggest hydropower plant in the world:

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benefits: alternative way of producing electric power, is always available, non fossile
drawbacks: expensive, not very economical.

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Drawbacks
High-pressure tanks weigh much more than the hydrogen so a full tank contains only 5.7% hydrogen. Hydrogen fuel is hazardous and it also tends to leak easily from tanks.

Benefits
Hydrogen is an energy carrier that can be used to store, move, and deliver energy produced from other sources. It is used in cars, in houses, for portable power, and in many more applications.

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Black Colorful Stickers Straightforward Classroom Rules Education Portrait Poster

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How do wind turbines work? - Rebecca J. Barthelmie and Sara C. Pryor