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 the process of turning alternating current into direct current. A rectifier uses devices like diodes to allow current to flow in only one direction, which converts the alternating waveform into pulsating direct current. That’s why the statement that a rectifier converts AC to DC is the correct one.

The other ideas don’t fit: inverting DC to AC would require a different device (an inverter). A filter can smooth a DC output but doesn’t by itself change AC into DC. And a rectifier isn’t defined by increasing voltage without rectification; boosting voltage involves transformers or other circuitry, not the basic rectification action of converting AC to DC.