Q5. Classify different sources of energy on the basis of physical state and occurrence , Give one example
Answers
Answer:
Energy is the capacity of a physical system to perform work. Energy exists in several forms such as heat , kinetic or mechanical energy, light, potential energy , electrical, or other forms. Energy is the ability to do work. Energy sources could be classified as Renewable and Non-renewable
Explanation:
1. Renewable
Renewable energy is derived from natural processes that are replenished constantly such as solar, wind, ocean, hydropower, biomass, geothermal resources, and biofuels and hydrogen.
a) Solar Energy
Sun is the primary source of energy. Sunlight is a clean, renewable source of energy. It is a sustainable resource, meaning it doesn't run out, but can be maintained because the sun shines almost every day.
b) Wind Energy
Wind is the natural movement of air across the land or sea. The wind when used to turn the blades of a wind mill turns the shaft to which they are attached. This movement of shaft through a pump or generator produces electricity.
c) Water
The flowing water and the tides in the sea are sources of energy. India is endowed with large hydropower potential of 1,45,320 MW. Heavy investments are made on large projects.
d) Geothermal energy
Geothermal Energy is heat stored in earth crust and being used for electric generation and also for direct heat application. Geothermal literally means heat generated by earth.
2. Non Renewable energy
Coal, Oil and Natural gas are the non-renewable sources of energy. They are also called fossil fuels as they are products of plants that lived thousands of years ago. Fossil fuels are the predominantly used energy sources today. India is the third largest producer of coal in the world, with estimated reserves of around 3,19,020.33 million tonnes of Geological Resources of Coal (as of 1.4.2018). Coal supplies more than 70.87% of the country's total production of energy by commercial sources. India consumes about 245 MT of crude oil annually, and more than 70% of it is imported. Burning fossil fuels cause great amount of environmental pollution.