Answer:
Electric energy conservation which converts into heat and light
Step-by-step explanation:
The transformation of energy from one form energy into another form, and throughout this conversion, the energy that we give to a device will comes out. However, the energy that is given may or may not coming out in the required form.
For example, we plug in a lump means we give an electrical energy into a lamp and the lamp produces light, but we also get heat energy from the lamp(it is the form of energy which is undesirable coming from a lamp).