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प्रश्न
What is the function of brushes in an electric generator?
उत्तर
Brushes maintain the contact between slip rings (commutator) in an A.C. generator (D.C. generator). So, the current produced in the rotating coil can be tapped out through slip rings (commutator) into the brushes.
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संबंधित प्रश्न
Name some sources of direct current.
Explain the principle of 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
The frequency of alternating current (a.c.) supply in India is:
(a) 0 Hz
(b) 50 Hz
(c) 60 Hz
(d) 100 Hz
State one advantage of using a.c. over d.c.
Explain the difference:
AC generator and DC generator.
State change that you would make to convert an A.C. generator into a D.C. generator. Illustrate the change by a diagram.
State true or false:
The frequency of AC is 50 Hz.
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 coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is held stationary inside the coil?
