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प्रश्न
Explain the principle of an electric generator.
उत्तर
An electric generator works on the principle of electromagnetic induction. It states that when a conductor is moved in a magnetic field, current is induced in the conductor.
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संबंधित प्रश्न
State the principle of an electric generator.
Name some sources of direct current.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each______.
Name the phenomenon which is made use of in an electric generator.
Complete the following sentence:
A generator with commutator produces ............... current.
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
Draw a labelled diagram of a simple a.c. generator.
An a.c. generator changes the ______energy to ______ energy.
A flat coil of wire rotates at a constant speed about an axis perpendicular to a uniform magnetic field. Draw a graph to show how the induced e.m.f. varies relative to the positions of the coil during its one complete rotation. At what position of the coil, the e.m.f. has the maximum value?
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.
