Energy is defined as ‘the capacity to do work’. Sun is the primary source of energy.
Joule is the standard unit of energy in SI units. Energy utilization is an index of economic
development, which does not take into account of ill effects/damage on to environment.
From 1900 to 2000 population increased by 3 times while energy consumption by 14 times!
All energy sources ultimately come from the sun, the moon or the earth.
Sources of Energy
Solar energy drives the following:
The global climate system which give as wind power.
Solar heating and Solar lighting
The global ecosystems which give as biomass power such as wood or muscle.
The ancient ecosystem whose energy is now stored as fossil fuels.
The moon’s gravitational energy is responsible for the ideal effect, which give rise to tidal power.
The earth itself is the key source of energy such as the following:
Gravitational energy for hydroelectric power
Chemical energy for nuclear power, electro- chemical reaction and hydrogen fuel cells.
Geothermal power from the heat of lower crust.
Other exciting energy sources are currently untapped, such as energy in the earth’s magnetic field, the energy potential caused by temperature differences in different layers of the ocean and the energy contained in combustible deposits of methyl hydrates in the sediments of the continental shelves. There are undoubtedly energy types we have not yet discovered. The relatively recent discovery of radiation remains us that novel discoveries will continue to happen. There are also energy types that are not new but are simply untapped. The average human beings give of f 60 watts of heat by simply standing in a room. With effective insulation and ventilation it is possible to heat many building types by the heat energy of their occupants alone.
Types of Energy Energy resources can be described as