The present invention facilitates relatively accurate power consumption estimates performed at the register transfer level for scaleable circuits with similar architectural characteristics and features. The method comprises the step of exposing the electrical component to an evaporative fluid that is in fluid and thermal contact with the electrical component. Therefore, the flux concentration cores are able to be arranged around the bus bars even when the spaces between the bus bars are narrow. A variable-engagement clutch is operatively connected to the input and the hydraulic pump such that the input selectively drives the hydraulic pump during engagement of the clutch to provide hydraulic fluid pressure to the hydraulically-actuated clutch.