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Coal, natural gas, oil and nuclear energy. Page 3. 3. 2.Secondary Energy sources. Secondary fuels produce no net Energy Scenario: Classification of Energy Sources, Energy resources (Conventional and ecs.umass.edu/mie/labs/rerl/hy2/theory/pdf/users.pdf,Sources of Energy. Renewable Energy. Solar Energy; Wind Energy; Biomass and Biofuels; Water and geothermal. Non Renewable energy; Related Resources. Muscle power (human or animal) did just about everything else. All these energy sources came from the sun, since solar energy drove wind and rain, grew trees, Science. 242. Sources of. Energy. 14. CHAPTER. In Class IX, we learnt that the total energy during a physical or chemical process is conserved. Key concepts. ? Solar energy is a natural and renewable resource. ? Heat energy from the sun can be used to heat things such as water. describe various types of sources of energy e.g. fossil fuels, water, wind, biomass, sea, geothermal, nuclear energy; recognise that the sun is the ultimate