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List any four sources of energy. 

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List of sources of energy:- 

1. Hydro energy (P.E. of water) 

2. Nuclear energy (Heat is produced by fission processes of U235) 

3. Fossil fuels: 

i) Thermal energy (by combustion of coal) 

ii) Natural gas energy (by combustion of natural gas consists mainly methane.) 

iii) Diesel/Petrol energy 

4. Solar Energy: 

i) Photovoltaic Systems (Direct conversion to electricity) 

ii) Solar Thermal Power plant (In direct conversion to electricity) 

5. Ocean Energy: 

i) Ocean Tidal Energy 

 ii) Ocean Wave Energy 

 iii) Ocean Thermal Energy 

6. Geothermal Energy 

6. Bioenergy: 

i) Biofuels (e.g. Bio-diesel, Ethanol) 

ii) Biomass (e.g. sugar cane bagasse, farming waste, forestry waste etc.) 

iii) Biogas (it is produced from any organic waste materials. It contains mixture of methane (50-65 % in volume) and carbon dioxide 

7. Fuel Cells (hydrogen) 

b) Name any two thermal power

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