Various forms of Energy are:
Heat Energy
A heat is defined as a transfer (flow) of thermal energy across certain boundary (for example, from a hot body to cold via the area of their contact. Heat may be defined as energy which moves from an object having high temperature object to an object having lower temperature . An object does not possess “heat”; we refer to the energy in an object as its internal energy. This internal energy can be increased by the process of heating.
Heat energy is transferred as a result of a temperature difference. Energy as heat passes from a warm body with higher temperature to a cold body with lower temperature.
The transfer of energy as a result of the temperature difference alone is referred to as heat flow. The Watt, which is the SI unit of power, can be defined as 1 J/s of heat flow. Other units used to quantify heat energy is Calorie
Mechanical Energy
Mechanical energy manifest in many forms, but can be broadly classified into elastic potential energy and kinetic energy. However the term potential energy is a very general term, because it exists in all force fields, such as gravitation, electrostatic and magnetic fields. Potential energy refers to the energy any object gets due to its position in a force field.
Electric Energy:
The electric potential energy of given configuration of charges is defined as the work which must be done against the Coulomb force to rearrange charges from infinite separation to this configuration
Chemical Energy:
Chemical Energy is the energy due to associations of atoms in molecules and various other kinds of aggregates of matter. It may be defined as a work done by electric forces during re-arrangement of mutual positions of electric charges, electrons and protons, in the process of aggregation. So, basically it is electrostatic potential energy of electric charges. If the chemical energy of a system decreases during a chemical reaction, the difference is transferred to the surroundings in some form (often heat or light). On the other hand if the chemical energy of a system increases as a result of a chemical reaction – the difference then is supplied by the surroundings (usually again in form of heat or light).
