Abstract: A power adapter includes a body having an upper portion on which a first plug is formed for connection with a wall outlet and a lower portion defining a recess with an axle formed therein for rotatably supporting a reel. A lid is attached to the body for covering the recess. The reel includes a first disk and a second disk mounted together with a coil spring received therebetween. The coil spring biases the reel in a winding direction for winding a cable thereon. The cable has a first end extending through a central bore of the axle and electrically connected to the first plug and a second end extending beyond the body through an opening defined in the body. A second plug is formed on the second end for connection with an electrical device. The cable may be extended out of the body by being pulled in an unwinding direction against the coil spring. A locking slide is mounted on the body and movable between a closed position and an open position.