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An electronic circuit is a system electronic components that when assembled together forms to device that can perform a task. Electric circuits are comprised of components including resistors, transistors, capacitors, inductors and diodes. Electronic circuits can be categorised as analogue, digital, or a hybrid of the two. Analogue circuits have a variable input/output currents or voltages whilst digital circuits have exact values expressed as "on" and "off."
A familiar application of a digital electronic circuit is the processor in a personal computer. Another fundamental component in digital electronic circuits is the transistor, which is used to switch the electronic signals.