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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
Suppose the loop is stationary but the current feeding the electromagnet that produces the magnetic field is gradually reduced so that the field decreases from its initial value of 0.3 T at the rate of 0.02 T s−1. If the cut is joined and the loop has a resistance of 1.6 Ω how much power is dissipated by the loop as heat? What is the source of this power?
Obtain the expression for the emf induced in the rotating coil of N turns each of cross-sectional area A, in the presence of a magnetic field `vecB` .
Describe briefly, with the help of a labelled diagram, the basic elements of an A.C. generator.
Give the principle of AC generator.
A hot wire ammeter reads 20 A in AC. circuit. The peak value of the current is ______
When the plane of the armature of a generator is parallel to the field. in which it is rotating ______.
A resistor, capacitor, and inductor are connected in series across an AC generator. Which of the following statements is false?
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 ______.
An AC generator spinning at a rate of 750 rev/min produces a maximum emf of 45 V. At what angular speed does this generator produce a maximum emf of 120 V?
