What does rectifier mean?
A rectifier is an electrical device or circuit that converts alternating current into direct current, or changes an electrical signal so that it has the desired polarity. It is used in power supplies, battery chargers, radio equipment, and many other electronic systems. In technical contexts, a rectifier is commonly paired with terms such as bridge, full-wave, and half-wave, describing the arrangement or operating principle of the device. The word can also mean a person or thing that puts something right, although this broader sense is formal and much less common today. Its name reflects its original idea of making something straight or correct: an electrical rectifier directs current in a consistent direction, just as the older metaphorical sense suggested correcting an irregularity.
An electrical device or circuit that converts alternating current into direct current, or changes an electrical signal so that it has a desired polarity.
"The rectifier in the power supply converts the incoming alternating current into direct current."
This is the dominant modern technical sense. Common compounds include bridge rectifier, full-wave rectifier, and half-wave rectifier.
A person or thing that rectifies something by correcting an error, defect, or wrongdoing.
"The commission appointed a rectifier to oversee the correction of the accounts."
This is a formal and relatively uncommon sense.
The plural is used for multiple devices, circuits, or people acting as correctors.
"The technician replaced two faulty rectifiers in the power supply."
A rectifier gives alternating current a one-way ticket, turning its back-and-forth motion into a steady flow.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does rectifier come from?
The word comes through Latin rectificare, meaning “to make straight” or “to make right,” from rectus (“straight” or “right”) and facere (“to make”). The English noun developed in a general sense of something that corrects or straightens before becoming especially common for electrical devices that convert alternating current into direct current. Related English words include rectify, rectitude, rectilinear, and rectus.
Related word forms
How rectifier is actually used
In modern usage, rectifier usually refers to an electrical component. The broader sense of someone who corrects or puts something right is formal and relatively uncommon.