Enegrgy is comsved but it can change it's forms from one to another but the total enrgen will always be conseved.
Some examples are given below.
Light source or eletric bulb- for bulb we take every in the form of electric from any souce but total enegy is same as much as we are giving to bulb it convetinco from one form to another but total is same as take from power source. Some enrgye is getting converted in the form of light other is heating the bulb and near arer if bulb is making some noice may be very small some it going to sound Energy but total enegy is same as enegy given. It's just changing it's forms.