FIRST LAW OF THERMODYNAMICS
Law Conservation Of Energy We know that energy exists in different forms such as nuclear energy ,chemical energy , electric potential energy , elastic energy , radiant energy, thermal energy and sound energy etc. All these energies can be changed from one form to another form. However, these energies cannot be created or destroyed. NOTE: Energy can neither be created nor destroyed. It only changes from one form to another. the total amount of energy remains constant in a system. EXAMPLE OF LAW CONSERVATION OF ENERGY. 1. When the driver applies the brakes on a moving car, the brakes will be rubbed against the car wheels. Hence the mechanical energy of a car is changed in to heat energy due to friction between the brakes and moving car wheels. 2. In electric ovens, the electric energy is converted into heat energy. 3. During charging of battery, the electrical energy is converted into chem