This diagram of a dynamometer set depicts a device for measuring force, a moment of force, or power. The power created by an engine, motor, or another rotating prime mover can be calculated by measuring torque and rotational speed simultaneously (rpm). A dynamometer can also calculate the torque and power needed to run a driven machine, such as a pump. A motoring or driving dynamometer is used in this case. An absorption or passive dynamometer is a dynamometer that is designed to be driven. This dynamometer set diagram shows that a universal or active dynamometer can either go or absorb.
