... atoms. An atom is defi ned as the smallest unit of an element which may be added to or be taken away from a molecule. Atoms may exist singly but are usually combined with one or more atoms to form ... Power Generation 3rd Edition A. J. Pansini K. D. Smalling 10 Guide to Electric Power Generation This page intentionally left blank Planning and Development of Electric Power Stations 7some cases hydro ... distance was found and led to larger central stations instead of the small local area stations. As AC (alternating current) transmission developed to permit sending power over longer distances,...