Work, Energy and Power, Types of Energy, Basic Concepts, Definition (For CBSE, ICSE, IAS, NET, NRA 2022)

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Work, Energy and Power

  • Work, energy, and power are the most used terms in Physics.
  • Work and energy can be considered as two sides of the same coin
  • Work done is generally referred in relation to the force applied while energy is used in reference to other factors such as heat.
  • Power is defined as work done per unit time.


Work is Said to be Done when a Body or Object Moves
DefinitionWork is said to be done when a force applied to an object moves that object.
FormulaWe can calculate work by multiplying the force by the movement of the object.

UnitThe SI unit of work is the joule (J)
DetailsWork is said to be done when a body or object moves with the application of external force.


Define Energy as the Capacity to Do Work
DefinitionIn physics, we can define energy as the capacity to do work.
FormulaFor the potential energy the formula is

UnitThe SI unit of energy is joules (J) , which is named in honour of James Prescott Joule.
detailsEnergy can neither be created nor destroyed. It can only be transformed from one kind to another.

Energy is found in many things and thus there are different types of energy.

All forms of energy are either kinetic or potential.

The energy in motion is known as Kinetic Energy whereas Potential Energy is the energy stored in an object and is measured by the amount of work done.

Types of Energy

  • Mechanical energy
  • Mechanical wave energy
  • Chemical energy
  • Electric energy
  • Magnetic energy
  • Radiant energy
  • Nuclear energy
  • Ionization energy
  • Elastic energy
  • Gravitational energy
  • Thermal energy
  • Heat Energy


Power Can be Defined as the Rate at Which Work
DefinitionPower can be defined as the rate at which work is done i.e.. , energy converted.
FormulaThe formula for power is

UnitThe unit of power is watt (W) .

Basic Concepts

Basic Concepts

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