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प्रश्न
Study the following principle and answer the question.
A force is excreted on the current carrying conductor. The direction of this force depends on both the direction of the current and the direction of the magnetic field. This force is maximum when the direction of current is perpendicular to the direction of the magnetic field.
a) By which law we can determine the direction of force excreted on the current carrying conductor.
b) In which electrical equipment this principle is used.
c) Draw a diagram representing construction of this equipment.
d) Write the working of this equipment in brief.
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उत्तर
a. Fleming’s left hand rule
b. Electric motor
d. completed, the current flows through the coil in the direction A-B-C-D.
ii. The coil is in the magnetic field therefor according to Fleming’s left hand rule force exerted on the AB branch is in downward direction and on the CD branch it is in upward direction.
iii. After half rotation current in the coil start flowing through D-C-B-A direction.
iv. therefore, on DC branch force is in downward direction and BA branch it is in upward direction so its complete remaining half rotation.
In this way after every half rotation the direction of the current in the coil changes and coil continue to rotate.
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संबंधित प्रश्न
Draw figure ‘Electric motor’ and working
Name any four appliances where electric motor is used.
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.
Brushes
Explain the function of the following parts of an electric motor.
Split ring
Label the four parts of an electric motor
Electric motor works on the magnetic effect of electric current.
A motor converts one form of energy into another. Name the two forms.
What is the function of a commutator in an electric motor made ?
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
Fill in the following blank with suitable words:
Fleming's Rule for the motor effect uses the .......... hand.
Fill in the following blank with suitable words:
A motor contains a kind of switch called a .......... which reverses the current every half .......... .
State what would happen to the direction of rotation of a motor if:
the current were reversed
State what would happen to the direction of rotation of a motor if:
both current and magnetic field were reversed simultaneously.
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
Tell the odd one out. Give a proper explanation.
Which device is used to produce electricity? Describe with a neat diagram.
In which electric motor appliances do we use it?
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.
Which of the following converts electrical energy into mechanical energy?
State whether true or false. If false, correct the statement.
A generator converts mechanical energy into electrical energy.
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.
An electric motor is a device which transforms ____________.
Commercial electric motors do not use ____________.
The moving part of an electric motor is called ______.
Observe the following diagram and answer the questions.
- Construction of which equipment does the above diagram show?
- On which principle does this equipment work?
- According to which law the coil ABCD rotates?
- Write the law in your own words.
- Where is this equipment used?
