Generally we use electric energy to do some work. For example just go through the picture 1,the picture tells about the electric bulb. Electric bulb is a device that works on electric energy. As we all know when electric energy is given to the electric bulb, the bulb glows.
Here the input energy is the electrical energy and the output energy is the light energy and the heat energy. This is how electric energy conversion takes place.
Electric Energy ------- > Light Energy + Heat Energy