The purpose of a light bulb in a circuit is to serve as a load. It converts electrical energy into light energy, creating visible light that can be used for illumination or signaling.
A light bulb serves as the load in a circuit. When connected to a power source, such as a cell or battery, and a switch, an electric current flows through the wire and into the light bulb. The light bulb converts electrical energy into light energy, thus illuminating the surroundings.
