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प्रश्न
State the principle on which the AC generator works. Draw a labelled diagram and explain its working.
उत्तर
A.C generator principle:
Whenever a closed coil is rotated in a uniform magnetic field about an axis perpendicular to the field, the magnetic flux linked with coil changes and an induced emf is set up across its ends.
The construction of an ac generator is shown in the figure. Initially, the coil ABCD is horizontal. The coil starts rotating clockwise and the arm AB moves up while CD moves down. By Fleming’s right hand rule, the induced current flows along ABCD. In second half rotation, the arm CD moves up and AB moves down. The induced current flows in the opposite direction that is along DCBA. Thus, an alternating current flows in the circuit.
संबंधित प्रश्न
State the working of a.c. generator with the help of a labeled diagram.
The coil of an a.c. generator having N turns, each of area A, is rotated with a constant angular velocity ω. Deduce the expression for the alternating e.m.f. generated in the coil.
What is the source of energy generation in this device?
Answer in brief.
For a very high-frequency AC supply, a capacitor behaves like a pure conductor. Why?
List out the advantages of stationary armature-rotating field system of AC generator.
Elaborate the standard construction details of AC generator.
How are the three different emfs generated in a three-phase AC generator? Show the graphical representation of these three emfs.
The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements correctly depicts the phenomenon taking place?
The average value of alternating current over a full cycle is always ______. [I0 = Peak value of current]
A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are ______.
Obtain the expression for the instantaneous value of emf induced.
With the help of a labelled diagram, describe the principle and working of an ac generator. Hence, obtain an expression for the instantaneous value of the emf generated.
