An electric wrench is a power tool used for tightening and loosening nuts and bolts quickly and with high force. It is commonly used in automotive repair, construction, and industrial work. Unlike manual wrenches, it uses an electric motor to reduce effort and increase efficiency. The tool typically consists of a motor, a gearbox or impact mechanism, a square drive for attaching sockets, a handle, and control switches for speed and direction.
In operation, the correct socket is attached to the square drive and fitted onto the nut or bolt. When the tool is switched on, the motor rotates the drive, applying torque to the fastener. In models with an impact mechanism, the tool delivers rapid bursts of force, making it easier to loosen tight or rusted bolts and tighten them securely. The user can control the speed and direction (tightening or loosening) using the switch. After completing the task, the machine is switched off and the socket is removed if necessary.
