In the field of physics, the Joule can be defined as the derived unit of energy. As per the International System of Units, one Joule is equal to the work performed on or the energy transmitted to an object on which a force of one Newton acts to shift the object by one metre in the direction in which the force was applied.
Alternatively, when one ampere of electric current passes through one metre of an appropriate conductor with a resistance of one ohm, the Joule can be defined as the heat energy that is dissipated.
1 J is the amount of work done when a force of 1N displaces a body by 1 m in the direction of force.
1 J = 1 N x 1 m