DC
DC (abbreviation) means Direct current: an electric current that flows steadily in one direction, of the kind supplied by batteries, solar panels and USB chargers. Example: “Most household electronics run on DC even though the wall socket delivers AC.”
How to Use DC
Learner’s notesIn plain EnglishElectricity that flows one way, like from a battery — or short for Washington, D.C.
The electrical sense is technical but everyday; the geographical sense is standard in American writing.
Fill the Gap
Can you complete this real example?
Most household electronics run on _____ even though the wall socket delivers AC.
Etymology
An initialism, in the electrical sense of direct current and in the geographical sense of District of Columbia.
Antonyms
Related Words
Frequently Asked Questions
What is the difference between AC and DC?
DC (direct current) flows in one constant direction at a steady voltage, as it does from a battery. AC (alternating current) reverses direction many times a second, which makes it easy to step up and down with transformers, so it is what mains electricity uses.
Should DC be written with full stops?
Both DC and D.C. are correct. British style generally drops the stops; American style keeps them in Washington, D.C., though modern usage increasingly writes DC.
Why do phones and laptops need adapters?
They run on low-voltage DC, but the mains supplies high-voltage AC, so the power brick converts and steps the supply down.