An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow.
Electric circuits are classified in several ways. A direct-current circuit carries current that flows only in one direction. An alternating-current circuit carries current that pulsates back and forth many times each second, as in most household circuits.
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The article explains the fundamental components of an electrical circuit, including the source, load, and conductors, and covers key concepts such as voltage, current, resistance, and the differences between AC and DC currents.