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प्रश्न
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.
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उत्तर
- The figure shows the construction of an electric generator.
- Principle of electric generator: Electric generator works on the principle of electromagnetic induction. When the coil of the electric generator rotates in a magnetic field, the magnetic field induces a current in this coil. This induced current then flows into the circuit connected to the coil.
- Uses of electric generator are-
- Providing backup energy for emergencies.
- Powering construction sites.
- Powering nuclear reactor plants.
- Providing backup for hospitals and other office buildings
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संबंधित प्रश्न
The device used for producing electric current is called a ______.
Name the device which converts mechanical energy into electric energy.
What change should be made in an a.c. generator so that it may become a d.c. generator?
What is the function of brushes in an electric generator?
What is the major difference between the simple alternator and most practical alternators?
Complete the following sentence:
A generator with commutator produces ............... current.
An electric generator converts:
(a) electrical energy into mechanical energy.
(b) mechanical energy into heat energy.
(c) electrical energy into chemical energy.
(d) mechanical energy into electrical energy.
The current induced in a closed circuit only if there is ______.
Name and state the principle of a simple a.c. generator. What is its use?
What determines the frequency of a.c. produced in a generator?
Draw a labelled diagram of a simple a.c. generator.
Draw a neat labeled diagram of an A.C. generator
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?
State change that you would make to convert an A.C. generator into a D.C. generator. Illustrate the change by a diagram.
The given figures 1 to 3 show the working of a simple A.C. generator. Study the diagrams and answers of the following questions.
(i) State and explain the principle underlying the working of a simple generator.
(ii) Where is the loop of wire placed?
(iii) What happens when the loop is rotated?
(iv) Indicate the direction of the current flow through the wire for the first half of the turn (in first figure). Name and state the rule used in finding the direction of the current.
(v) Indicate the direction of the current for the case shown in second figure.
(vi) Indicate the direction of current in the outer circuit (i.e., electric bulb) in first and third figure.
(vii) What type of current is shown in the above diagrams? Explain.
To convert an AC generator into DC generator ____________.
