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प्रश्न
What are the special features of commercial electric motors?
उत्तर
Special features of commercial electric motors are:
The coil is wound on a soft iron core; therefore, the strength of magnetic field increases.
The coil contains large number of turns of insulated copper wire.
A powerful electromagnet is used in place of permanent magnet.
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संबंधित प्रश्न
Explain the construction and working of an electric motor.
Of what substance are the brushes of an electric motor made?
In an electric motor, which of the following remains fixed and which rotates with the coil?
Commutator ; Brush
In a d.c. motor, why must the current to the coil be reversed twice during each rotation?
State what would happen to the direction of rotation of a motor if:
the current were reversed
In an electric motor, the direction of current in the coil changes once in each:
two rotations
one rotation
half rotation
one-four rotation
What is an electric motor?
State whether true or false. If false, correct the statement.
A generator converts mechanical energy into electrical energy.
How can the speed of rotation of a coil be increased? Write at least three methods.
The most suitable material for making permanent magnets is ______.
