# 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: