Source of Energy

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The Source of Energy

Energy is the power or capacity to do work such as the capacity to move an object by the application of force. Energy can exist in a variety of numbers, such as thermal, mechanical, chemical, or nuclear, and can be transformed from one form to another. The electrical energy is caused by the movement of electric charges called electrons. Energy is a conserved quantity, and as the law of conservation of energy states energy can be converted in any form, but it can neither be created nor destroyed. The world has everything either in the form of energy or matter. 

9 Sources of Energy

Energy is used to power the devices we use for heat and light in our homes, for transportation and for the manufacture of all kinds of products. The primary use of these different sources of energy is to produce electricity. These all different sources of energy add to the store of electrical power that is then sent out to different locations via high powered lines.

There are 9 Main Different Sources of Energy are:- 

  • Solar energy

  • Wind energy

  • Geothermal energy

  • Hydrogen energy

  • Tidal energy

  • Wave energy

  • Hydroelectric energy

  • Biomass energy

  • Nuclear power energy

Solar Energy 

It is the energy from the sun that is harnessed using a range of technologies such as solar heating, solar architecture, photovoltaics, and artificial photosynthesis. It is an essential source of renewable energy. The mechanism by which silicon solar panels harness the sun's energy and generate electricity is known as photovoltaic effect.


  • Reduce Electricity bills

  • Low maintenance cost

  • Technology development


  • Weather dependent

  • Solar energy storage is expensive.

  • Uses a lot of space

Wind Energy 

It describes the process by which wind is used to generate electricity. Wind turbines convert the kinetic energy in the wind into mechanical power and that mechanical power can also be utilized for specific tasks.


  • Clean & environment-friendly fuel source.

  • Cost-effective


  • Notice and aesthetic pollution.

  • Threat to wildlife

  • Fluctuations of wind 

Geothermal Energy 

It is the heat that comes from the surface of the earth. It is contained in the rocks and fluid beneath the earth's crust. The oldest form of geothermal energy is dry steam. It takes out of the ground and uses it to directly drive the turbine. 


  • High efficiency 

  • Little to no geothermal system maintenance.


  • High investment cost

  • Location restricted

  • Sustainability

Hydrogen Energy 

It involves the use of hydrogen or hydrogen compounds to generate energy to be supplied to all practical uses. It is a zero-emission fuel burned with oxygen. It can be used in combustion engines or fuel cells. It is also used as a fuel in rocket propulsion.


  • It is fuel-efficient.

  • It is renewable.

  • It does not produce harmful emissions.


  • It is expensive.

  • It is difficult to store.

  • It is highly flammable.

Tidal Energy 

It is the form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity. They are more predictable than the wind and the sun.


  • It is Continuous, predictable energy.

  • The longevity of equipment.


  • The impact of EMF emissions.

  • High construction costs.

Wave Energy 

It is produced by the up and down motion of floating devices placed on the surface of the ocean. The energy provided is most often used in power plants, water pumps, and desalination plants. 


  • It is abundant and widely available.

  • Easily predictable.

  • No damage to the land.


  • It is suitable for certain locations.

  • It is highly dependent on the wavelength.

  • They also generate noise and visual pollution.

Hydroelectric Energy 

It is the energy derived from the movement of water. It has kinetic energy when it moves, which can be harnessed. Basically, it is the electricity produced by hydropower. 


  • It is reliable and adjustable.

  • It is emission-free.

  • It is completely renewable.


  • Higher initial costs.

  • Flood risk.

  • Carbon and methane emissions.

Biomass Energy 

It is the use of organic material to generate energy. Biomass is just organic matter that is made in nature like dung, grass clippings, etc. It is a renewable source of energy.


  • It is carbon neutral.

  • It is less expensive than fossil fuels.

  • It's a revenue source for manufacturers.


  • It is not entirely clear.

  • It can lead to deforestation.

  • It requires a lot of space.

Nuclear Power Energy 

It is the use of nuclear reactions that release nuclear energy to generate heat which is used in steam turbines to produce electricity in a nuclear power plant.


  • It is less expensive.

  • No greenhouse gases.


  • It harms plant and animal life.

  • It is a water pollutant.

FAQ (Frequently Asked Questions)

1. Why are we looking at alternative sources of energy?

The reason why we are looking at alternate sources of energy is that fossil fuels are non- renewable sources of energy i.e, fossil fuels are not available in large quantities and it cannot be replenished. If their consumption is not controlled, fossil fuels will get exhausted. These sources of energy are limited and it will disappear after some time. Fossil fuels are being consumed at a large rate. A good source of energy would be one that would do a large amount of work per unit mass or volume. Therefore, it is better to switch to an alternate source of energy.

2. How will you identify a good source of energy?

This can be identified when useful energy is either recovered or extracted from directly or by means of a transformation process or conversion. A good source of energy fulfills the following criteria:-

  • It is economical.

  • The energy source should be able to provide energy over a long period of time- means it should be easily accessible.

  • It produces a lot of heat per unit mass- it means that the output energy must be more than that of the input energy.

  • It is easy to store and transport.

  • It produces less amount of smoke.

  • It does a large amount of work per unit mass.