AC adapter is specified as a transformer-type power supply that plugs into an ac (alternating current) power outlet and provides low voltage ac or dc (direct current) to provide power for accessory equipment.
It is an external power supply for a camera or other electronic device that converts AC (alternating current) from a wall plug to DC (direct current). It is used instead of a battery to power a device. Some AC adapters also double as rechargers.
Ref: 120882/2006-10-05
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Alternative Spellings (Synonyms): adapters