Which device converts AC to DC in power supplies?

Which device converts AC to DC in power supplies?

• A. Diode-based power packs
• B. Inductors
• C. Resistors
• D. Lamps

Answer: (A)

Rectification is the process of turning alternating current into direct current. This relies on a component that conducts current in only one direction. A diode does exactly that: it passes current forward but blocks it when the current would reverse. In a diode-based rectifier circuit, AC is converted into a unidirectional, pulsating DC output, which is then often smoothed to a steady DC by capacitors. This is why power supplies use diode-based devices to provide DC. Inductors store energy and oppose changes in current, but they don’t create DC from AC. Resistors simply dissipate energy as heat and don’t change AC to DC. Lamps convert electrical energy into light (and heat) and likewise don’t provide a DC output from AC.

Rectification is the process of turning alternating current into direct current. This relies on a component that conducts current in only one direction. A diode does exactly that: it passes current forward but blocks it when the current would reverse. In a diode-based rectifier circuit, AC is converted into a unidirectional, pulsating DC output, which is then often smoothed to a steady DC by capacitors. This is why power supplies use diode-based devices to provide DC.

Inductors store energy and oppose changes in current, but they don’t create DC from AC. Resistors simply dissipate energy as heat and don’t change AC to DC. Lamps convert electrical energy into light (and heat) and likewise don’t provide a DC output from AC.