In a photocell, light energy is converted to electrical energy. A photocell is a device that uses the photoelectric effect to produce an electric current. When light falls on a photocell, the energy of the photons is transferred to the electrons in the material of the photocell. This energy is sufficient to cause some of the electrons to break free from their atoms, creating a flow of electrons or an electric current. Thus, the light energy is converted to electrical energy by the photocell.