简介: In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another. The mechanism of a switch may be operated directly by a human operator to control a circuit,may be operated by a moving object such as a door-operated switch, or may be operated by some sensing element for pressure, temperature or flow. Switches are made to handle a wide range of voltages and currents; very large switches may