In an electric wire the charge that moves is in a particle called the electron. Each electron has a very small electric charge of negative one elementary charge. The elementary charge is the smallest electric charge found in a stable particle. A coulomb is equal to 6,241,509,629,152,650,000 elementary charges. The coulomb was named in honor of Charles-Augustin de Coulomb who worked on understanding electric charge in the late 1700s.