This lecture is presented by Ms. Apoorva Gupta, Asst. Professor of Biyani International Institute of Engineering And Technology. Generator is basically that device which convert mechanical power into electrical power .There are five types of generator first, separately excited generator .second self excited generator which is further subdivided into two types series excited generator and shunt excited generator third one is compound excited generator it is sub divided into long shunt compound excited generator and short shunt compound excited generator.

second system of pulleys consisting of two blocks. The upper block carries three wheels which freely rotate about their individual central axes and are supported over a single common axle which is firmly fixed to a rigid upper frame. The lower block also contains similar pulley and axle mechanism; however the whole structure is supported by one end of an intertwined string configuration passing through the pulleys, as illustrated in the figure. The other end termination of the string which passes across the uppermost pulley is used for the application of the effort. The weight is supported by the axle of the lower block. And as usual MA and the efficiency may be written as given for the first system of pulleys.