At 09:20 PM 5/12/00 -0400, you wrote: >Hi Group, > >If I have a pump or some device that is holding a 100lb object in the air and >the mass is at rest, and I measure the current and voltage to the pump to get >the pump power input. How can I relate that to the 100lbs? > >Say V=12 and I=10A for 120watts. > >The question is how does force relate to power given that the object is not >in motion. Energy = Power x time = Force x distance. Off-hand, I'd say that, since there is no force x distance, no work is being done. The voltage represents the potential energy and its space derivative the force. The current flow and power I would assume represent losses, not work. ================================================================ Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: ral@lcfltd.com Least Cost Formulations, Ltd. URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239 Fax: 757-467-2947 "Vere scire est per causas scire" ================================================================