A surgical instrument is disclosed, the instrument including: a handle assembly； a jaw assembly including a staple cartridge containing a plurality of staples and an anvil to form the plurality of staples upon firing； a lockout mechanism configured to prevent reuse of the jaw assembly； a drive assembly at least partially located within the handle and connected to the jaw assembly； a motor operatively coupled to the drive assembly； and a controller operatively coupled to the motor, the controller configured to control supply of electrical current to the motor and to monitor a current draw of the motor, wherein the controller is further configured to terminate the supply of electrical current to the motor in response to a drop in the current draw.
