AVIXA AV Math Practice Test 2025 - Free AVIXA AV Math Practice Questions and Study Guide

Converting voltage from AC (Alternating Current) to DC (Direct Current) is primarily accomplished through the use of a rectifier. A rectifier is an electronic device that allows current to flow in one direction only, effectively changing the bidirectional flow of AC into a unidirectional flow that characterizes DC.

When AC voltage is applied to a rectifier, specifically a diode or a series of diodes (in the case of a bridge rectifier), the diodes conduct during the positive half of the AC cycle and block current during the negative half. This process converts the alternating voltage into pulsating DC. To obtain a smoother and more stable DC signal, the pulsated output can further be filtered using capacitors to reduce voltage ripple, but the fundamental conversion from AC to DC relies on the rectification process carried out by the rectifier.

While transformers can step up or step down AC voltage and capacitors can be used for filtering and smoothing, they do not perform the essential conversion from AC to DC. Potentiometers, on the other hand, are variable resistors and are used for adjusting levels such as volume or brightness in a circuit but are not involved in the conversion between AC and DC. Therefore, the rectifier is the correct