Answer :
internal energy is defined as the energy associated with the random, disordered motion of molecules.
example-
when oil is reacted with oxygen, potential energy is released, since new chemical bonds are formed in the products which are more powerful than those in the oil and oxygen. The energy resulting from this process may be converted directly to electricity , or into thermal energy
example-
when oil is reacted with oxygen, potential energy is released, since new chemical bonds are formed in the products which are more powerful than those in the oil and oxygen. The energy resulting from this process may be converted directly to electricity , or into thermal energy