An engine dynamometer is a device used to measure the power output and performance of an engine. It works by applying a load to the engine while measuring parameters such as torque and RPM (revolutions per minute). This information helps engineers and manufacturers assess engine efficiency and make necessary adjustments. There are two main types of engine dynamometers: water brake and eddy current. The water brake dynamometer uses water to create resistance, while the eddy current dynamometer uses electromagnetic induction. Both types provide valuable data for testing engines in various applications, including automotive and industrial settings.