Acids: Indicators, General characteristics, Properties of acids, Chemical nature of acids.
Sources of Energy: A source of energy is that which is capable of providing enough useful energy at a steady rate over a long period of time.
A Good source of energy should be :
Characteristics of a good fuel
Classification of Sources of energy
The sources of energy can be classified as follows :
1. Renewable sources of energy: Renewable sources of energy are those which are inexhaustible, i.e., which can be replaced as we use them and can be used to produce energy again and again.
These are available in an unlimited amount in nature and develop within a relatively short period of time.
Example of Renewable Sources of Energy :
Advantages of Renewable Sources of Energy
2. Non-Renewable Source of Energy: Non-renewable sources of energy are those which are exhaustible and cannot be replaced once they have been used. These sources have been accumulated in nature over a very long period of millions of years.
Examples of Non-renewable Sources of Energy :
Disadvantages of Non-renewable Sources of Energy
Fossil Fuels: Fossil fuels are the remains of prehistoric plants and animals which got buried deep inside the early millions of years ago due to some natural processes.
These fossil fuels are non-renewable sources of energy and cause environmental problems due to pollution.
Formation of Fossil Fuels: During its formation, an entire organism or its parts often get buried in sand or mud. These, then decay and disintegrate leaving no signs of their existence. Infact, the harder parts of organisms after their death settle down and are covered by sediments and subjected to extreme pressure and temperature or the Earth converts them into fossil fuels, the process being referred to as fossilization.
Disadvantage of Fossil Fuels
Thermal Power Plants: It generates electricity from heat produced by combustion of coal and petroleum. For example; fossil fuels.
Use coal, petroleum and natural gas produce thermal electricity.
Electricity transmission is very efficient.
The steam produced by burning fossil fuels nans the turbine to produce electricity.
Source of energy are also classified as
(i) Conventional Sources of Energy are those which are used extensively and meet a marked portion of our energy requirement and these are :
(a) Fossil fuels (coal, oil and natural gas) and
(b) Hydro energy (energy of water flowing in rivers).
Biomass energy and wind energy also fall in this category as these are being used since ancient times.
(ii) Non-conventional Sources of Energy are those which are not used as extensively as the conventional ones and meet our energy requirement only on a limited scale. Solar energy, ocean energy, (tidal energy, wave energy, ocean thermal energy, OTE), Geothermal energy and nuclear energy belong to this category. These sources of energy which have been tapped with the aid of advances in technology to meet our growing energy needs are also called alternative sources of energy.