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प्रश्न
Tell the odd one out. Give proper explanation.
Loud speaker, Microphone, Electric motor, Magnet.
पर्याय
Loud speaker
Microphone
Electric motor
Magnet
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उत्तर
Magnet
Explanation:
Others devices are based on the phenomenon of electromagnetism while the magnet is not.
APPEARS IN
संबंधित प्रश्न
What is the Principle of an Electric motor?
Name any four appliances where electric motor is used.
What is the role of the split ring in an electric motor?
State whether the following statement is true or false.
An electric motor converts mechanical energy into electrical energy.
Name some devices in which electric motors are used
Explain the function of the following parts of an electric motor.
Armature
Explain the function of the following parts of an electric motor.
Brushes
Label the four parts of an electric motor
Electric motor works on the magnetic effect of electric current.
State whether the following statement is true or false:
An electric motor converts mechanical energy into electrical energy.
What is the function of a commutator in an electric motor made ?
In an electric motor, which of the following remains fixed and which rotates with the coil?
Commutator ; Brush
What is the role of the spilt ring in an electric motor?
Fill in the following blank with suitable words:
A motor contains a kind of switch called a .......... which reverses the current every half .......... .
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:
In what ways can a motor be made more powerful?
In an electric motor, the direction of current in the coil changes once in each:
two rotations
one rotation
half rotation
one-four rotation
An electric motor is a device which transforms:
mechanical energy to electrical
heat energy to electrical energy
electrical energy to heat energy only
electrical energy to mechanical energy
Which device is used to produce electricity? Describe with a neat diagram.
Name some of the devices in which electric motor are used.
Electric motors are devices that convert electrical energy into mechanical energy.
What is an electric motor?
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.
State whether true or false. If false, correct the statement.
The speed of rotation of an electric motor can be increased by decreasing the area of the coil.
List the main parts of an electric motor.
An electric motor is a device which transforms ____________.
Commercial electric motors do not use ____________.
Material of the core of a strong magnet is ____________.
The most suitable material for making permanent magnets is ______.
The moving part of an electric motor is called ______.
Define electric motor.
