Most of it is generated in different types of power plants, which use fossil fuels, nuclear power, wind, water, or geothermal energy as the various sources of electricity.
How to Generate Electricity
Electricity is generated in different types of power plants. The basic mechanism involves use of the various sources to rotate the blades of a turbine and generate electricity. As the blades rotate, electricity is produced in the generator.
This principle was first found by British scientist Michael Faraday. As per the principle, when an electrical conductor (say copper wire) is rotated between the poles of a magnet, electricity is generated.
Sources of Electricity
However, as a result of heavy dependence of the world on fossil fuel for source of electrical energy, they are being depleted at a much faster rate than they can be formed. This is putting strain on the remaining deposits of fossil fuel and making the world look for alternative energy sources.
A major problem of using fossil fuels to generate electricity is that burning them gives out a lot of toxic gases that pollute the environment and contribute to global warming.
Due to its immense potential, lot of research is being done on nuclear energy so that it becomes one of the major electricity sources. However, one major problem of using nuclear energy as an electric power source is managing nuclear waste. These are radioactive products whose radiations can have harmful effects on the living things.
Although utmost care is being taken so that they are safely disposed, effects of nuclear radiations on the plant life in the oceans where they are dumped mostly raises a big question of the efficiency of these measures.
Also, despite the fact that the fission reactions are very well controlled in nuclear power plants, in case the checks fail, it can lead to a nuclear disaster.
Solar Energy: It is converted either directly into electricity with the use of solar cells or photovoltaic cells or indirectly by using solar thermal collectors that harvest solar energy.
Other forms of renewable energy resources are biomass, geothermal energy, and tidal energy.
Out of the mentioned sources, a few have been used since long, while others are recent inclusions to the list. Nevertheless, the whole world is working to find a reliable (preferably renewable) source of electricity that can meet the world's never ending need of power.