In the x-ray circuit, which device converts alternating current (AC) to direct current (DC)?

• A. Autotransformer
• B. Step-up transformer
• C. Rectifier
• D. Falling load generator

Answer: (C)

Rectification is the process of turning alternating current into direct current. In the x-ray circuit, the power from the wall is AC, but the x-ray tube needs current that flows in one direction to produce a stable, controllable x-ray beam. The rectifier uses diodes to block the negative half of each AC cycle, allowing current to pass only in one direction and creating pulsating direct current. Modern systems smooth this with capacitors to reduce ripple, delivering a steadier tube current. The other components don’t convert AC to DC: transformers (including the autotransformer and step-up) and related voltage-changing parts keep the current alternating while adjusting voltage, and the falling load generator serves regulation or exposure control rather than rectification.