Law of Conservation of Energy, Examples on Types of Energy (For CBSE, ICSE, IAS, NET, NRA 2022)

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Law of Conservation of Energy

  • The law of conservation of energy is one of the basic laws in physics.
  • It governs the microscopic motion of individual atoms in a chemical reaction.
  • The law states that “In a closed system, i.e.. , a system that isolated from its surroundings, the total energy of the system is conserved.”
  • According to the law, the total energy in a system is conserved even though the transformation of energy occurs.
  • Energy can neither be created nor destroyed, it can only be converted from one form to another
  • This is particularly confusing in the case of non-conservative forces, where energy is converted from mechanical energy into thermal energy, but the overall energy does remain the same.
  • The only way to use energy is to transform energy from one form to another.
  • The amount of energy in any system, then, is determined by the following equation:

  • = the total internal energy of a system
  • = the initial internal energy of a system
  • W = the work done by or on the system
  • Q = the heat added to, or removed from, the system

It is also possible to determine the change in internal energy of the system using the equation:

Examples on Types of Energy

Following are the examples of types of energy:

Kinetic Energy

A child swinging on a swing with no negative value irrespective of the back-and-forth motion.

Gravitational Energy

The atmosphere of the earth is held due to gravitational energy.

Chemical Energy

Energy stored in an electrochemical cell.

Mechanical Energy

  • An object possessing mechanical energy has both kinetic and potential energy, although the energy of one of the forms may be equal to zero.
  • A moving car has kinetic energy.
  • If you move the car up a mountain, it has kinetic and potential energy.
  • A book sitting on a table has potential energy.

Thermal Energy

A cup of hot coffee has thermal energy. You generate heat and have thermal energy with respect to your environment.

Nuclear Energy

Nuclear fission, nuclear fusion, and nuclear decay are examples of nuclear energy. An atomic detonation or power from a nuclear plant are specific examples of this type of energy

Chemical Energy

A good example of chemical energy is an electrochemical cell or battery.

Electromagnetic Energy

Any form of light has electromagnetic energy, including parts of the spectrum we can՚t see. Radio, gamma rays, x-rays, microwaves, and ultraviolet light are some examples of electromagnetic energy.

Sonic Energy

Sonic energy is the energy of sound waves. Sound waves travel through the air or another medium.

Example: A sonic boom, a song played on a stereo, your voice.

Potential Energy

  • When a child swinging on a swing reaches the top of the arc, she has maximum potential energy. When she is closest to the ground, her potential energy is at its minimum (0) .
  • Another example is throwing a ball into the air. At the highest point, the potential energy is greatest. As the ball rises or falls it has a combination of potential and kinetic energy.

Ionization Energy

The first ionization energy of an atom is the energy needed to remove one electron completely. The second ionization energy is energy to remove a second electron and is greater than that required to remove the first electron.

Developed by: