"Electric Motor" Electricity and Magnetism PPT Courseware 5

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"Electric Motor" Electricity and Magnetism PPT Courseware 5

Question: Have you ever heard of an electric motor (motor)? Why does the motor rotate when it is powered on?

Review: What did Oersted’s experiment show?

Oersted's experiment shows that electric current, like a magnet, also produces a magnetic field.

Review: What are the basic properties of magnetic fields?

The basic property of a magnetic field is that it exerts a magnetic force on magnets in the magnetic field.

Question: Does the magnetic field also exert a magnetic force on the current (current-carrying wire) in the magnetic field?

The effect of magnetic fields on current-carrying wires and coils

Activity: Explore the effect of magnetic field on current-carrying wires P115

Phenomenon: When the switch is closed and current flows through wire AB, wire AB moves.

Only the direction of the current in wire AB is changed, and wire AB moves in the opposite direction.

By changing only the direction of the magnetic field at wire AB, the motion of wire AB also changes.

Thinking: If the direction of the current in wire AB and the direction of the magnetic field are changed at the same time, what is the direction of movement of wire AB?

Classroom exercises

1. The energized coil will be affected by ______ in the magnetic field, and the direction of the force is related to ______ and ______.

2. A current-carrying conductor will experience a force in a magnetic field, which is actually ( )

A. Other energy can be converted into mechanical energy

B. Convert mechanical energy into electrical energy

C. Convert electrical energy into mechanical energy

D. Mechanical energy is converted into thermal energy

3. The direction of the force exerted on the energized conductor in the magnetic field can be judged by ( )

A. Ampere’s rule B. Right-hand rule

C. Left-hand rule D. Right-hand spiral rule

4. When a current-carrying conductor is acted upon by a force in a magnetic field, the direction of the force is related to ( )

A. The direction of current in a conductor

B. The direction of the magnetic field where the conductor is located

C. Direction of cutting magnetic field lines

D. The direction of the magnetic field in which the conductor is located and the direction of the current in the conductor

Class summary

1. An energized conductor will be acted upon by a force in a magnetic field. The effect of the force is actually the result of the interaction between the current magnetic field and the magnetic field of the magnet. The direction of the force is related to the direction of the current and the direction of the magnetic field. It can be determined by the left-hand rule. judge.

2. The energized coil will rotate under the action of force in the magnetic field, but it cannot continue.

3. The force exerted on the energized wire in the magnetic field is the result of the conversion of electrical energy into mechanical energy.

Classroom exercises

1. A current-carrying conductor in a magnetic field ( )

(A) It must be affected by the magnetic field force (B) It may be affected by the magnetic field force

(C) It must not be affected by magnetic field force (D) None of the above statements are correct

2. Regarding the direction of force, current direction and magnetic field lines of a current-carrying conductor in a magnetic field

The relationship between directions. Which of the following statements is wrong ( )

(A) When the direction of the current changes, the direction of the force on the conductor changes;

(B) When the direction of the magnetic field changes, the direction of the force on the conductor changes;

(C) The direction of the current and the direction of the magnetic field change at the same time, and the direction of the force on the conductor changes;

(D) The direction of the current and the direction of the magnetic field change simultaneously, and the direction of the force on the conductor remains unchanged.

Classroom reinforcement exercises

1. The DC motor can continue to rotate mainly because ( )

A. The function of coil B. The function of current

C. The role of magnetic field D. The role of commutator

2. When the DC motor is working, when the coil passes the position of the vertical magnetic field line ( )

A. The force on the coil is balanced and the speed is zero.

B. The force on the coil is balanced and the speed is not zero.

C. The force on the coil is unbalanced and the speed is zero.

D. The force on the coil is unbalanced and the speed is not zero.

3. Which of the following statements is correct ( )

A. An electric motor is a machine that converts mechanical energy into electrical energy.

B. An electric motor is a machine that converts electrical energy into mechanical energy.

C. DC motors use the rotation of coils to generate current.

D. Changing the direction of the current in the coil can change the speed of the motor coil rotation

Keywords: Electricity and magnetism teaching courseware, Electric motor teaching courseware, New People's Education Edition ninth-grade physics PPT courseware, Ninth-grade physics slide courseware download, Electricity and magnetism PPT courseware download, Electric motor PPT courseware download, .ppt format

For more information about the PPT courseware "Electrical Motors, Electricity and Magnetism", please click on the Electric Motors ppt Electricity and Magnetism ppt tab.

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Update Time: 2024-11-24

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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