when the coil of d.c generator rotates in the magnetic field is produced in the coil
Answers
Explanation:
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Magnetic Effects of Electric Current
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Explain, the principle, construction and working of d.c. generator.
D.C. generator: A d.c. generator is a device which converts mechanical energy into electrical energy.
D.C generator has split ring commutator instead of slip rings.
Split ring commutator: It consists of two semicylindrical brass rings S1 and S2 rigidly attached to the two ends of the armature coil. As the armature coil rotates, the two split rings also rotate about the same axis of rotation.
Fig. D.C. generator
Working: Suppose initially the plane of the coil is horizontal. The split ring S1 touches the brush B1 and S2 touches B2. When coil ABCD is rotated clockwise, magnetic field lines passing through it change. The arm AB moves upwards and arm CD moves downwards. According to Fleming’s right hand rule, the induced current in the armature coil flows in the direction ABCD. In the external circuit, current flows from B2 to B1. As the coil crosses its vertical position, the split ring S1 comes in contact with B2 and S2 with B1. The arm AB now moves downwards and arm CD moves upwards. The induced current in the armature flows along DCBA. But in the external circuit, the current still flows from B2 to B1. Hence, a unidirectional current flows in the external circuit.
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