Amps, or amperes, are a unit of measure for electric current. Electric current is the flow of electrons through a conductor, and it is measured in amperes (A). The amount of current flowing through a circuit is determined by the amount of voltage applied to the circuit and the resistance of the circuit. In a simple circuit, the current is directly proportional to the voltage and inversely proportional to the resistance. For example, if the voltage applied to a circuit is increased, the current will also increase, unless the resistance of the circuit is also increased. Understanding the relationship between voltage, current, and resistance is important in the design and operation of electrical systems.