A pulsating direct current is a direct current (dc) that changes in value over short periods of time.
A pulsating direct current may change in value, i.e., be always present but at different levels, or it may be interrupted completely. The changes may be irregular or at regular intervals (at a specific frequency), but the current never changes direction.
Pulsating currents are commonly the consequence of using diode rectifiers, or DC sources of lower amplitude connected in series with AC sources.
Pulsating direct current is used on PWM controllers.
Difference from AC 
Pulsating current only changes its voltage, while AC changes its voltage and also changes the intensity and polarity.
- This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
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