4.2 describe energy transfers involving the following forms of energy: thermal (heat), light, electrical, sound, kinetic, chemical, nuclear and potential (elastic and gravitational)

Energy can change from one form to another, and frequently does. Some examples include:
Chemical energy in food turns into kinetic energy for movement;
Electrical energy in a circuit turns into heat energy in a resistor;
Kinetic energy in your muscles turns into sound energy from you voice.
Elastic potential energy in a taught rubber band turns into kinetic energy when it sails through the air.