In this load characteristic, the torque is constant across the entire speed range. The power is therefore directly proportional to the speed and therefore, reducing the speed will also reduce the power required in a linear fashion.

e.g. screw compressors and conveyors

Also called quadratic torque loads, the torque of the load is proportional to the square of the speed. The load power is therefore proportional to the cube of the speed.

e.g. centrifugal pumps, fans and blowers