1, AC: DC power supply is a device to maintain constant voltage and current in the circuit.

2.DC: refers to the AC power supply, which refers to the plug and socket used to connect the AC power supply provided by the mains.

Second, the characteristics are different.

1, AC: positive and negative. The potential of the positive electrode is high and the potential of the negative electrode is low. When two electrodes are connected to the circuit, a constant potential difference can be maintained at both ends of the circuit, thus forming a current from the positive electrode to the negative electrode in the external circuit.

2.DC: The continuous fluctuation range of AC input voltage shall not exceed 10%, and the harmonic content shall not exceed relevant regulations. The AC power supply of uninterruptible power supply device should not be supplied by the same transformer and bus as other impact loads.

Third, the roles are different.

1, AC: an energy conversion device, which converts other forms of energy into electric energy supply circuit to make it flow stably in the holding current.

2.DC: AC regulated power supply can't stabilize the output voltage under any AC voltage input, but it has an adaptation range.

Baidu encyclopedia-AC power supply

Baidu encyclopedia -DC power supply