Power adapter

A power adapter, comprising:

• a body comprising a top plate, a first sidewall, a second sidewall, a stopper portion, and an engaging portion, wherein the first sidewall and the second sidewall are located on two opposite sides of the top plate, and form a receiving groove with the top plate and the stopper portion, and the engaging portion is a notch between the first sidewall and the stopper portion, or a through hole on the first sidewall;
• and
• a plug disposed in the receiving groove and comprising a first side plate and a second side plate arranged oppositely, wherein the first side plate is provided with a slot, the slot divides the first side plate into a stationary portion and a movable portion, and the movable portion is provided with a bump configured to engage with the engaging portion,
• wherein an inner surface of the first sidewall and an inner surface of the second sidewall are separated by a first distance, an outer surface of the first side plate and an outer surface of the second side plate are separated by a second distance, an outer edge of the bump and the outer surface of the second side plate are separated by a third distance, and the first distance is greater than or equal to the second distance and is less than the third distance.