Which waveform category provides a constant unidirectional flow of current?

Which waveform category provides a constant unidirectional flow of current?

• A. Direct current (DC) provides a constant unidirectional flow.
• B. Alternating current (AC) reverses direction sinusoidally.
• C. Pulsed current delivers current in bursts with off-times.
• D. Mixed current combines DC and AC.

Answer: (A)

Direct current provides a constant unidirectional flow because the current moves in one direction continuously without reversing. The polarity stays the same, so the direction stays fixed over time. Alternating current reverses direction with each cycle, so it isn’t a constant flow. Pulsed current delivers current in bursts with off-times, so the flow isn’t continuous even though each burst is unidirectional. Mixed current combines DC with AC components, so it isn’t a single steady direction. Therefore, the waveform category that gives a constant unidirectional flow is direct current.

Direct current provides a constant unidirectional flow because the current moves in one direction continuously without reversing. The polarity stays the same, so the direction stays fixed over time. Alternating current reverses direction with each cycle, so it isn’t a constant flow. Pulsed current delivers current in bursts with off-times, so the flow isn’t continuous even though each burst is unidirectional. Mixed current combines DC with AC components, so it isn’t a single steady direction. Therefore, the waveform category that gives a constant unidirectional flow is direct current.