Photovoltaic reinforced plate working princip discussed in greater detail in the following chapters. The working principle of solar cells is based on the photovoltaic effect,i. the generation of a potential difference at the junction of two differ nt materials in response to electromag-netic. Solar Cell Definition: A solar cell (also known as a photovoltaic cell) is an electrical device that transforms light energy directly into electrical energy using the photovoltaic effect. An electric current flows into the wires. Solar cells collect energy from sunlight and convert it into electricity. The photovoltaic system diagram is the fundamental design asset for installing an efficient solar energy system.