The term back current refers to an electric current that flows in the opposite direction to the intended current flow in an electrical circuit. This is often caused by a change in electrical or magnetic conditions within a circuit, resulting in unwanted feedback. Some synonyms for back current include reverse current, reflected current, and feedback current. Reverse current refers specifically to a current flowing in the opposite direction to its intended flow, while reflected current typically refers to a current that is reflected back in a transmission line. Feedback current can refer more broadly to any current that results from an unwanted feedback loop. Regardless of the term used, back currents can cause serious problems in electronic or electrical systems and must be properly addressed.