Electric current is the flow of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is the rate at which electric charge flows past a point on a circuit. The intensity of the electric current is determined by the amount of charge passing through a conductor in a unit of time and is measured in amperes (A). Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers. Time-varying currents emit electromagnetic waves, which are used in telecommunications to broadcast information. The formula for electric current is I = V/R, where I is the current, V is the voltage, and R is the resistance.