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Electronic equipment An a.c. generator/dynamo It produces  alternating current  energy from mechanical energy of rotation of a coil. It is based on the phenomenon of EMI. The form of e,m,f. induced is e=e0sin ωt. A d.c. generator/dynamo It produces direct current energy from mechanical energy of rotation of a coil. It principle and working are same as those of a.c. generator. There is only a little change in the design of the generator. Slip Ring arrangement used in a.c. generator is replaced by Slit Ring arrangement or commutator arrangement in d.c. generator. A d.c. motor D.C. motor converts direct current energy from a battery into mechanical energy of rotation. It is based on the fact that when a coil carrying current is held in a  magnetic field , it experiences a torque, which rotates the coil. The efficiency of d.c. motor is given byby η = E/V= back e.m.f./e.m.f. of battery The efficiency becomes maximum, when E = V/2 A motor starter is a variable  ...