Electronics is the study and use of electronic devices, which control the flow of electrons or other charged particles. Such devices include transistors, resistors, transducers, and semiconductor circuits.
Electronic devices and circuits perform a very wide range of useful tasks, including receiving sensory inputs and converting them into electrical signals; controlling, processing, and distributing information; converting and distributing electric power; and creating or detecting electromagnetic fields and currents.
Electronic systems can be divided into three basic parts: inputs; processing; and outputs. Sensors receive inputs such as temperature or pressure from the physical world and converts them into electrical signals. Processing circuits manipulate, interpret and transform these signals. Output devices convert the processed results back into a useful physical form. For example, a digital camera samples light signals from the real world (input); extracts color and brightness information and stores it in a digital form (processing); then displays the picture information on a camera or computer screen (output).