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प्रश्न
Tell the odd one out. Give a proper explanation.
Find the odd one out and give its explanation.
विकल्प
Loud speaker
Microphone
Electric motor
Magnet
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उत्तर
Magnet
Explanation:
A standard magnet is a material that permanently produces its own magnetic field without needing an external power source. In contrast, loudspeakers, microphones, and electric motors are all devices that specifically rely on the principles of electromagnetism to function. Because those three convert between electrical and mechanical energy using electromagnetic fields, the simple magnet stands as the odd one out.
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संबंधित प्रश्न
Draw figure ‘Electric motor’ and working
What is the Principle of an Electric motor?
Name any four appliances where electric motor is used.
Name some devices in which electric motors are used
Explain the construction and working of an electric motor.
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.
A motor converts one form of energy into another. Name the two forms.
What is the other name of the split ring used in an electric motor?
Of what substance is the core of the coil of 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?
State what would happen to the direction of rotation of a motor if:
both current and magnetic field were reversed simultaneously.
State what would happen to the direction of rotation of a motor if:
In what ways can a motor be made more powerful?
What are the special features of commercial electric motors?
In an electric motor, the direction of current in the coil changes once in each:
two rotations
one rotation
half rotation
one-four rotation
Name some of the devices in which electric motor are used.
Electric motor : converts electrical energy into mechanical energy : : Electric generator : _______
Right or wrong sentence.
Electro chemicals 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.
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.
List the main parts of an electric motor.
Direction of rotation of a coil in electric motor is determined by ____________.
In an electric motor, to make the coil rotating continuously in the same direction, the current is reversed in the coil after every half rotation by a device called ____________.
Material of the core of a strong magnet is ____________.
Draw a labelled circuit diagram of a simple electric motor and explain its working. In what way these simple electric motors are different from commercial motors?
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 ______.
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?
