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The main uses of electronic circuits are the controlling, processing and distribution of information, and the conversion and distribution of electric power. Both of these uses involve the creation or detection of electromagnetic fields and electric currents. More broadly, most electronics systems fall into the category of either control systems or communication systems.

While electricity had been used for some time to transmit data over telegraphs and telephones, the development of electronics truly began in earnest with the advent of radioFor other uses see: radio (disambiguation Radio is a technology that allows the transmission of signals by modulation of electromagnetic waves with frequencies below those of light. Radio waves Radio waves are a form of electromagnetic radiation, and are. Today, electronic devices perform a much wider variety of tasks.

One way of looking at an electronic system is to divide it into the following parts:

1. InputInformation processsing In information processing, input is the process of receiving information from an object. The word input is used as a noun (information received or the process of receiving it) and less often as a verb (to receive information; or tos - Electrical or mechanical sensors (or transducerA transducer is a device that converts one type of energy to another, or responds to a physical parameter. A transducer is in its fundamental form a passive component. If the component is electrical then it generally has two electrical terminals. See alsos), which take signals (in the form of temperature, pressure, etc.) from the physical world and convert them into current/voltage signals.
2. Signal processingSignal processing is the processing, amplification and interpretation of signals. Signals may come from various sources. There are various sorts of signal processing, depending on the nature of the signal, as in the following examples. Digital signal proc circuits - These consist of electronic components connected together to manipulate, interpret and transform the signals.
3. OutputInformation processsing In information processing, output is the process of transmitting information (verb usage). Output may also be used as a noun for information transmitted by an object. Telecommunications In telecommunication, the term output has thes - Actuators or other devices (also transducers) that transform current/voltage signals back into useful physical form.

Take as an example a televisionSee TV (disambiguation) for other uses and Television (band) for the rock band Television is a telecommunication system for broadcasting and receiving moving pictures and sound over a distance. The term has come to refer to all the aspects of television p. Its input is a broadcast signal received by an antenna or fed in through a cable. Signal processing circuits inside the television extract the brightnessBrightness is an attribute of visual perception in which a source appears to emit a given amount of light. Brightness" was formerly used as a synonym for the photometric term luminance and (incorrectly) for the radiometric term radiance''. Brightness" sho, colour and sound information from this signal. The output devices are a cathode ray tube that converts electronic signals into a visible image on a screen and magnet driven audio speakers.