In a circuit, three wires form a junction. The current in one of the wires is either 7A or 17A, which is either the sum of the currents in the two-wire or the difference of current between two wires.
Electric current is the movement of charged particles (electrons or ions) through a current-carrying conductor, under the effect of potential difference induced between the ends of the conductor. It's measured in Ampere(A), which is the SI unit for current. Current in a circuit is measured using a device referred to as an ammeter.
When several conductors or semiconductors come into physical touch, the result is an electrical junction. Thermoelectricity junctions, metal-semiconductor junctions, and p-n junctions are a few different forms of electrical junctions.
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