What is the device inside the power supply that changes AC to DC?

What is the device inside the power supply that changes AC to DC?

• A. Rectifier
• B. Inverter
• C. Transformer
• D. Regulator

Answer: (A)

Converting alternating current to direct current inside a power supply is done by a rectifier. A rectifier uses diodes arranged to steer current so it only flows in one direction, turning the alternating waveform into pulsating direct current. That pulsating DC is then smoothed by capacitors and stabilized by regulation to provide a steady DC output for the device. The other options don’t fit because an inverter does the opposite (DC to AC), a transformer handles AC to change voltage but does not convert to DC, and a regulator maintains a steady DC level after conversion rather than performing the AC-to-DC change itself.

Converting alternating current to direct current inside a power supply is done by a rectifier. A rectifier uses diodes arranged to steer current so it only flows in one direction, turning the alternating waveform into pulsating direct current. That pulsating DC is then smoothed by capacitors and stabilized by regulation to provide a steady DC output for the device.

The other options don’t fit because an inverter does the opposite (DC to AC), a transformer handles AC to change voltage but does not convert to DC, and a regulator maintains a steady DC level after conversion rather than performing the AC-to-DC change itself.