________ current flows in only one direction.

• A. Alternating
• B. Direct
• C. Pulsed
• D. Random

Answer: (B)

Direct current is the type where the flow of charge stays in the same direction, maintaining a constant polarity. This means electrons or conventional current move from the positive side through the circuit to the negative side without reversing direction. Batteries, DC power supplies, and solar cells produce this kind of steady, unidirectional flow, which is essential for devices and components that rely on a fixed polarity, such as diodes and many types of transistors.

Alternating current, by contrast, continually reverses direction as the voltage changes sign, so the current does not keep one direction. Pulsed current involves bursts of current, which may be unidirectional during the pulse but includes intervals with no flow, so the overall direction isn’t a constant one. Random current varies in direction without a predictable pattern.