Question

direct current, dc, flows in a _____ direction while alternating current, ac, the direction of flow ______. a single, is unidirectional b constant, periodically reverses c opposite direction, is multiple d periodically reversing, is constant

Explanation:

Direct current (DC) has a fixed, unchanging flow direction, meaning it moves in a constant direction. Alternating current (AC) is defined by its flow direction that switches back and forth at regular, periodic intervals.

Answer:

B. constant, periodically reverses