Abstract: An electric socket includes an electrically insulative bottom shell, two metal electrode clamps mounted inside the electrically insulative bottom shell, an electrically insulative top shell covering the electrically insulative bottom shell and having two bottom spacer ribs set between the two metal electrode clamps to keep them apart, and a sliding block slidably coupled to the electrically insulative top shell and movable between a locking position where a bottom protruding block of the sliding block pushes the free end of each spacer rib sideways against the front clamping strips of the metal electrode clamps, thereby causing the metal electrode clamps to be locked to the metal conducting blades of the inserted electric plug and an unlocking position where the bottom protruding block of the sliding block is released from the spacer ribs, thereby unlocking the meal electrode clamps from the metal conducting blades of the inserted electric plug.