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- 1. Open Ended
Name 4 examples of an electric motor in your everyday use.
- 2. Open Ended
The direction of the force acting on a wire in an electromagnetic field can be reversed by doing 2 things, name them.
- 3. Multiple Choice
The direction of the force is relative to both the...
direction of the current and the heat produced.
direction of the magnetic field and the current.
direction of the current only.
direction of the magnetic field only.
- 4. Multiple Choice
Fleming’s left-hand rule is used to indicate ...
Direction of force.
Direction of magnetic field.
Direction of current.
Direction of force, magnetic field and current.
- 5. Multiple Choice
Can we use any hand for this purpose?
No
Only with magnetic fields
Yes
Only when current is involved
- 6. Open Ended
We can increase the size of the force by increasing the following 3 things...
Name these 3 things.
- 7. Multiple Choice
We can change the direction of current by in a circuit...
by increasing the current
by adding one more battery
rotating the battery 180 degrees
by increasing the voltage
- 8. Open Ended
What will happen to a coil of wire in a magnetic field when current flows through it?
- 9. Multiple Choice
What are electric motors?
It is a device that converts mechanical energy into electrical energy to produce a turning effect.
It is a device that adds electrical energy to mechanical energy to produce a turning effect.
An electric motor is a device that produce a turning effect.
It is a device that converts electrical energy into mechanical energy to produce a turning effect.
- 10. Multiple Choice
Most motors are powered using direct current (DC), which is produced by cells and batteries.
False
True
Only some
Only one
- 11. Multiple Choice
Motors powered by mains electricity use alternating current (AC). These motors use electromagnets rather than permanent magnets.
True
Only two of them
False
Only one of them
- 12. Draw
Use the picture below and Explain how electrical energy and mechanical energy works
together. Make use of an easy drawing to indicate the result on this fan.
Background image - 13. Draw
Name any 4 parts of this electric motor.
Background image - 14. Open Ended
How can the strength of an electric motor be increased? Name 3 things.
- 15. Multiple Choice
Explain electromagnetic induction.
When a wire is moved across a magnetic field, a current is produced.
If a wire is moved over and away from a magnetic field, a current is produced.
If an insulator with no current is moved across a magnetic field, a current is produced.
If a wire is moved across a magnetic field, another magnetic field is produced.
- 16. Multiple Choice
How can the size of an induced current be increased? MARK THE WRONG ANSWER.
Increase the speed at which the coil rotates
Increase the strength of the magnetic field
Increase the number of turns in the screw
Increase the total area of the coil.
- 17. Draw
Make a drawing and indicate North, East, South and West directions.
Background image - 18. Open Ended
Name 5 things needed for making your own DC Motor.
- 19. Open Ended
Name 5 parts of this DC motor.
- 20. Multiple Choice
The coil is ____________ to the Magnetic field.
Up
Perpendicular
Down
Horizontal
- 21. Multiple Choice
Select the component that helps to differentiate between DC motor and AC motor
Stator
Commutator
Winding
Shaft
- 22. Multiple Choice
What is the meaning of AC and DC?
Always Current
Down Current
Alone Current
Direct Current
Alternating Current
Direct Current
Anderson's Current
Darning Current
- 23. Multiple Choice
What is the difference between AC and DC?
AC flows in one direction only, while DC alternates its direction.
AC changes its direction periodically, while DC flows in one direction only.
AC is always constant, while DC varies in intensity.
AC is used in homes, while DC is used in industries.
- 24. Multiple Choice
What is the role of brushes in a DC motor?
Brushes help cool down the motor
Brushes control the speed of the motor
Brushes are used for cleaning the motor
Transfer electrical power to the rotating armature
- 25. Multiple Choice
How does the speed of a DC motor vary with load?
Speed increases with an increase in load
Speed remains constant regardless of the load
Speed decreases with an increase in load.
Speed is not affected by the load
- 26. Multiple Choice
What is the function of commutator in a DC motor?
To increase the efficiency of the motor
To control the temperature of the motor
To regulate the speed of the motor
To reverse the direction of current flow through the armature windings
- 27. Multiple Choice
Explain the working principle of a DC motor.
A DC motor works by converting thermal energy into mechanical energy.
A DC motor functions by utilizing gravitational force to generate motion.
A DC motor operates based on the principles of nuclear fusion.
A DC motor works based on the principle of electromagnetic induction, where a current-carrying conductor in a magnetic field experiences a force that causes it to rotate.
- 28. Fill in the Blank
There is a __________________ around an electrified direct conductor
- 29. Fill in the Blank
The direction of force on the charged wire in the magnetic field is related to the direction of _________________ and magnetic field.
- 30. Multiple Choice
The magnetic field has an effect on the current carrying conductor.
False
Sometmes
Many times
True
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