The overall efficiency of a centrifugal pump is simply the ratio of the water (output). power to the shaft (input) power and is illustrated by the equation below. Î· = P W / P S where Î· is efficiency, P w is the water power, and P s is the shaft power.
While talking about difference between a ship and a boat, the first thing that comes to oneâs mind is their sizes. Traditionally people consider a ship as a large ocean going vessel, whereas boats are comparatively quite smaller in size.
The strict definition of a boat was a vessel that could be carried by a Ship. So Ships are heavy and boats are light. When compared to a similar sized object like a van the boat can be lighter, especially if it made from wood or fibreglass. The engine is the only heavy part of the boat (if it has one).