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Why, Alternating Current and Direct Current, of course! Both AC and DC describe types of current flow in a circuit. In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.
If the two wires are white and black, the black is hot and the white is neutral. If the wires are red and black, the red is hot and the black is neutral. Red and black are usually reserved for direct current, rather than alternating current, which is used in households.So it&#039;s unlikely to find this color combination in your home.Look for plus (+) and minus (-) symbols on the wires.f the wires are red and black, the red is hot and the black is neutral. Red and black are usually reserved for direct current, rather than alternating current, which is used in households. So it&#039;s unlikely to find this color combination in your home. Look for plus (+) and minus (-) symbols on the wires.