https://www.siwiey.com/blog/What-is-an-ac-adapter-for_bid-2789579.htmlAC adapter, namely AC power adapter, also known as alternating current power adapter, AC is the abbreviation of Alternating Current, which means alternating current. Since the mains voltage is generally 220V alternating current, and many electrical equipment need 5V, 12V or 24V direct current, an AC adapter is needed to convert the 220V alternating current voltage to the normal working direct current mode of electrical equipment.

Dulcia, Sep 11 2021 on redhotbelgian.com