The present invention discloses a power supply including a first conductive module, a second conductive module connected to the first conductive module, and a plurality of hollow sleeves. The first conductive module and the second conductive module respectively include a plurality of first clamping parts and second clamping parts, wherein a position of each second clamping part corresponds to one of first clamping parts. The hollow sleeves are housing around the first conductive module and the second conductive module. Each hollow sleeve includes at least one plug hole, and covers one of the first clamping parts and the corresponding second clamping part. When rotating the hollow sleeve, the plug hole selectively coincides with the first clamping part or the second clamping part, so that multiple fins of a plug are inserted into the first clamping part or the second clamping part through the plug hole.