Energy Conversion

Energy Conversion

Energy conversion also termed as energy transformation, is the process of changing one form of energy into another. Energy conversion occurs everywhere and every minute of the day. There are numerous forms of energy like thermal energy, electrical energy, nuclear energy, electromagnetic energy, mechanical energy, chemical energy, sound energy etc. According to the law of conservation of energy, energy is always conserved in the universe and can only be converted from one form to another. Therefore numerous energy conversions are taking place around us all the time.

Law of Energy Conversion

Thermodynamics is the study of how energy gets converted from one form to another. Details on how the laws of thermodynamics apply to the conversion of energy are given below.

The first law of thermodynamics states that energy can neither be created nor be destroyed, it can only be transformed into one form to another, which is also called as the law of conservation of energy or law of energy conversion. There are various types and forms of energy. Some examples of everyday energy conversions are provided below.

Scenario Energy conversions involved
Rubbing both hands together for warmth Kinetic Energy to Thermal Energy
A falling object speeding up Gravitational Potential Energy to Kinetic Energy
Using battery powered torchlight In the battery: Chemical to Electrical Energy
In the bulb: Electrical to Radiant Energy
In Geothermal Power Plant Heat Energy to Electrical Energy
In Thermocouple Heat Energy to Electrical Energy
In Hydroelectric Dams Gravitational potential energy to Electric Energy
In Electric Generator Kinetic energy / Mechanical work to Electric Energy
In Windmills Wind Energy to Mechanical Energy or Electric Energy
In OTEC Heat Energy to Electric Energy or Mechanical Energy
Using Microphone Sound Energy to Electric Energy
Photosynthesis in Plants Solar Energy to Chemical Energy
In Piezoelectrics Strain to Electric Energy
In Electric lamp Electric Energy to Heat and Light Energy
Burning of wood Chemical energy to Heat and Light Energy
In Fuel cells Chemical Energy to Electric Energy
In steam engine Heat energy to Mechanical Energy
In Electric heater Electric Energy to Heat

Energy Conversion

Examples of Energy Conversion

Some examples of sets of energy conversion in machines are explained below.

Coal-fired Power Plant

The sets of energy transformation inside a coal-fired power plant are given in the points below.

  • During the process of combustion, the chemical energy in the coal gets converted into thermal energy.
  • Then through the heat exchanger, the thermal energy of the exhaust gases gets converted into thermal energy of steam.
  • After that in the turbine, the thermal energy of steam gets converted into mechanical energy.
  • Finally, with the help of a generator, the mechanical energy gets converted into electrical energy.

Conventional Automobile

The sets of energy transformation in a conventional automobile are given in the points below.

  • Due to combustion, the chemical energy in the fuel gets converted into kinetic energy of the expanded gas.
  • Then the kinetic energy of the expanding gas gets converted into linear piston movement.
  • Then the linear piston movement gets converted into rotary crankshaft movement.
  • The rotary movement of drive wheels gets converted into linear motion of the automobile.

Stay tuned with BYJU’S to learn more interesting Physics topics like Ohm’s Law, Thermodynamics, Laws of Motion, etc.

Practise This Question

Compare two quantities — Quantity A and Quantity B — and then determine which of the following statements describes the comparison:

In a lens, if
u - distance of the object from the lens
v -  distance of the image from the lens

hi    - height of the image
h - height of the object