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प्रश्न
What determines the frequency of a.c. produced in a generator?
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उत्तर
The number of coil rotations, or alternating e.m.f., determines the frequency of the a.c. produced in the generator. Induced e.m.f. (e = e0 sin 2π nt) where n is the number of rotation made by coil per second and the current i = i0 sin 2π nt.
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संबंधित प्रश्न
Name the phenomenon which is made use of in an electric generator.
What is the function of brushes in an electric generator?
Each one of the following changes will increase emf (or voltage) in a simple generator except:
(a) increasing the number of turns in the armature coil
(b) winding the coil on a soft iron armature
(c) increasing the size of the gap in which the armature turns
(d) increasing the speed of rotation
Name and state the principle of a simple a.c. generator. What is its use?
Draw a labelled diagram of a simple a.c. generator.
In an a.c. generator the speed at which the coil rotates is doubled. How would this affect
- the frequency of output voltage,
- the maximum output voltage is doubled.
State one advantage of using a.c. over d.c.
Observe the figure and write the answers to the questions asked.
- The construction shown in the figure is of which device?
- Explain the principle on which this device works.
- Write any three uses of this device.
A device for producing electric current is ______.
An AC generator is provided with ______ slip rings that rotate with the coil.
