The torch above is composed of a battery, switch, and bulb. When the switch is turned on, the chemical energy stored inside batteries gets converted to electrical energy. The electrical energy is further converted into heat and light energy with the help of a bulb. Once the bulb emits light the light energy is sensed by our eyes and we can feel the heat energy if we touch the bulb itself. Also, if turned on for a longer time the chemical energy inside the battery gets dissipated.