What do the capacitors do in a phase controlled rectifer? a. help starting b. increase the current c. smooth out the DC voltage d. reduce heat when running

Capacitors in a phase-controlled rectifier are primarily used to smooth out the DC voltage. So, the correct answer is c. smooth out the DC voltage.

Here's a step-by-step explanation:

1. A phase-controlled rectifier is a device that converts AC voltage into DC voltage. It does this by controlling the phase angle at which the AC voltage is allowed to pass to the output.

2. The output of a phase-controlled rectifier is a pulsating DC voltage, which is not ideal for most applications.

3. This is where the capacitors come in. Capacitors are electronic components that can store and release electrical energy quickly.

4. When connected across the output of the rectifier, they charge up when the voltage increases and discharge when the voltage decreases.

5. This charging and discharging action smooths out the pulsating DC voltage, making it more stable and suitable for use in electronic devices.

So, capacitors in a phase-controlled rectifier are used to smooth out the DC voltage.