What is the difference between AC and DC voltage?

posted in: Constant Current Products Transformers

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Standard residential voltage coming out of your wall in the United States is 120 volts AC (60 Hertz). AC voltage means "alternating current," which means the direction/flow alternates back and forth 60 times per second.


Semper Fi's standard transformers step down 120 VAC to a nominal 12-or- 24VAC


DC, or "direct current," requires a power supply to convert AC into DC and current flows in one direction.


Most incandescent lamps can be powered by AC or DC voltage. Products requiring DC voltage may be damaged when driven with AC voltage.