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 renewable, non renewable and sustainable.
Renewable energy sources include
Ocean Thermal Exchange Capacity (OTEC) - based on temperature differences in ocean layers. Solar Power
Bio- fuels- also known as biomass fuels-such as alcohol form, sugar, methane from organic waste or charcoal from trees and biodiesel.
The key characteristics of renewable energies is that the energy sources are continually available, still some cases such as with hydro power and biomass, continuing availability requires good management – for example tree planting or river management. Other renewable like solar and wind power are available for the foreseeable future without any human intervention. Non- renewable types of energy include all the fossil fuels – coal, oil, gas and their derivatives such as petrol and diesel. The non- renewable are finite in supply because their rate of formation is so low that they are, in reality, finite sources.
Sustainable energy is a term sometimes applied to nuclear power. The supplies are not exactly renewable but they will lost for a very long time because a great of electricity is produced from a small amount of radioactive material.
In general, the three types of energy have very different characteristics. This means there is no ‘ideal’ energy source. The future will most likely to be a mix of sources with increase in emphasis on the renewable. Advantages and Disadvantages of various Energy Types
Lower running cost
Usually produced in small
Decentralized power production
Often very difficult to store
Available for the foreseeable future
Currently per unit cost of energy
is more compared to other types.
Available in highly concentrated
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