An integral component of the information system is the hardware that transports information via electrical signals. The lower volts carry the data and the higher volts drive mechanical devises such as disk srives and fans. Physical input of information comes from keyboards, microphones, scanners, and digitizing camaras.
Physical output is generated by printers, monitors, and speakers.
Secondary storage medium may be considered as output, although in a sense, it is only a temporary holding spot for information until the final output device is used.