A single phase induction motor is operating at a very light load during a large part of every day an draws 10 A from the supply. A device is propose to increase the efficiency of the motor. During the demostration, the device is placed in parallel with the unloaded motor and the current drawn from the supply drops to 8A. When two devices are placed in parallel, the current drops to 6A. What simple device will cause this drop in current? Is the efficiency of the motor increased by the device?