Question

explain the construction and working of an electric generator AC draw a neat labelled diagram

Answer 1

Principle:  Electric generator works on the principle of electromagnetic induction. When the coil of electric generator rotates in a magnetic field, the magnetic field induces a current in this coil. This induced current then flows into the circuit connected to the coil.

AC Generator:  A generator which converts mechanical energy into electric energy in the form of alternating current is called AC Generator.

Working:


a.        When the armature coil ABCD rotates in the magnetic field provided by the strong magnets, it cuts the magnetic lines of forces.

b.       Thus the changing magnetic field produces induced current in the coil. The direction of induced current is determined by the Flemings right hand rule.

c.        The current flows out through the brush B1 in one direction in the first half of the revolution and through the brush B2 in the next half revolution in the reverse direction, this process is repeated.

d.       Therefore, the induced current produced is of alternating nature. Such a current is called as alternating current.

(construction in attachment)

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Answer 2

Explanation:

AC generator has an electromagnet while a DC generator has permanent magnet. DC generator will generate a higher voltage. AC generator will generate a higher voltage. AC generator has slip rings while the DC generator has a commutator.