Classify sources of energy on the basis of physical state .give one example of each
Answers
Answer: 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. Coal or gas are not sustainable or renewable: once they are gone, there is none left. More and more people are wanting to use clean, renewable energy such as solar, wind, geothermal steam and others. It is called 'Green Power'. It lights our houses by day, dries our clothes and agricultural produce, keeps us warm and lots more. Its potential is however much larger
Advantages
It is a perennial, natural source and free
It is available in plenty
It is non-polluting
It does not emit any green house gases.
Solar energy offers decentralization in most (sunny) locations, meaning self-reliant societies.
One of the biggest advantages of solar energy is the ability to avoid the politics and price volatility that is increasingly characterizing fossil fuel markets.
It doesn’t result in the destruction of forests and ecosystems that occurs with most fossil fuel operations.
Disadvantages
Dependent on change in seasons / weather – hence they may not be used always
Requires high initial investments for productive use
Solar systems doesn’t work at night directly but the battery bank, which stores energy during day-time can be used during night.
Solar electricity storage technology has not reached its potential yet.
Solar panels are bulky. This is particularly true of the higher-efficiency, traditional silicon crystalline wafer solar modules.
Technologies for productive use of solar energy
Solar energy can be used to generate electricity. Through Solar Photovoltaic (SPV) cells, solar radiation gets converted into DC electricity directly. The generated electricity can either be used as it is or can be stored in the battery. The stored electrical energy can be used when solar energy is not available. SPV is nowadays successfully used for home and street lighting and water pumping in villages. In hilly areas, solar water heating is also being used.