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...Introduction in this lecture we consider various forms of rotating electrical machines these can be divided into generators which convert mechanical energy motors both types operate through the interaction between a magnetic field and set windings storey electronic systems pearson education limited oht simple ac generator noted earlier that faraday s law dictates if coil n turns experiences change flux then induced voltage v is given by nd dt area rotates with respect to b at particular time it an angle linking bacos rate d badsin dcos cos thus for arrangement shown below nbadsin nbacos therefore produces sinusoidal output as wires connected would get twisted use circular slip rings sliding contacts called brushes...