Which statement about a rectifier is true?

Which statement about a rectifier is true?

• A. It Converts AC to DC
• B. It Converts DC to AC
• C. It Filters Without Changing Waveform
• D. It Increases Voltage Without Rectification

Answer: (A)

Rectification is about turning alternating current into direct current. A rectifier uses devices like diodes (and sometimes SCRs) to conduct current in only one direction, producing DC output from an AC source. In welding, that DC provides a stable arc and smoother heat control, which is why rectifiers are essential for DC welding. The other statements describe actions the rectifier doesn’t perform: converting DC back to AC is what an inverter does; simply filtering would smooth a waveform without changing its direction of flow, which isn’t the rectifier’s job; and increasing voltage without a rectification step would require a separate stage, not the rectifier itself.