"Exploring the Magnetism of Electromagnets" Electromagnets and Automatic Control PPT Courseware

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"Exploring the Magnetism of Electromagnets" Electromagnets and Automatic Control PPT Courseware

Review the past and learn the new

1. The scientist who first discovered the magnetic effect of electric current was: ________.

2. Oersted’s experimental explanation: Like a magnet, a current-carrying conductor also has a magnetic field around it.

3. The distribution of magnetic induction lines of an energized solenoid is very similar to ________.

4. The relationship between the polarity of the energized solenoid and the direction of the current can be determined by ______________.

5. Right-hand spiral rule:

Hold the solenoid with your right hand and bend your four fingers toward the direction of the current in the solenoid. The end pointed by your thumb is the N pole of the solenoid.

1. What is an electromagnet?

Activity 1: Get to know electromagnets

Composition: coil and iron core

1.Definition: An electromagnet is a solenoid with an iron core.

2. Structure: solenoid, iron core

3. Working principle: magnetic effect of electric current

4. Characteristics of electromagnets: Activity 1 B

Discover through activities:

The electromagnet produces ______ when it is energized, and its magnetism is ___________ when it is de-energized. That is to say, its magnetism can be controlled by __________. It works using __________.

5. Homemade electromagnet

Use thin enameled wire to wind a certain number of turns on a large iron nail in one direction to make an electromagnet.

2. What factors are related to the magnetic strength of electromagnets?

1. Conjecture: The strength of the magnet may be related to the size of the current, the number of turns of the coil and the presence or absence of an iron core.

2. Experimental equipment: power supply, switch, rheostat, wire, ammeter, pin, electromagnet

3. Design circuit diagram:

4. Experimental methods and processes:

a. Experimental method: controlled variable method

b. Experimental process:

Experimental results

(1) The electromagnet is ____magnetic when energized, and ______ when powered off.

(2) The more ____ the current passes through the electromagnet, the more magnetic it becomes ______

(3) When the current is constant, the number of turns of the electromagnet coil is _____, and the magnetism is ____.

Advantages of electromagnets

(1) Whether the electromagnet is magnetic or not can be controlled by ___________

(2) The magnetic strength of the electromagnet can be controlled by___________

(3) The polarity change of the electromagnet can be realized by ___________.

3. Application of electromagnet

On-site training

1. As shown in the picture, to make the electromagnet have the strongest magnetism, the correct connection method is ( )

A. S1 is connected to 1, S2 is connected to 3

B. S1 is connected to 1, S2 is connected to 4

C. S1 is connected to 2, S2 is connected to 4

D. S1 is connected to 2, S2 is connected to 3

2: As shown in the figure, when the slider of the sliding rheostat moves to the right, the magnetism in the electromagnet will _______.

3. Connect the electromagnet, sliding rheostat, power supply and switch to form a closed circuit. If the sliding plate of the rheostat is moved to the right, the spring hanging the iron block at the upper end of the solenoid will:

A. unchanged B. shortened

C. Stretch D. Unable to judge

Thinking: What would happen if the hanging iron block was changed to a magnet?

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"Exploring the Magnetism of Electromagnets" Electromagnets and Automatic Control PPT Courseware 2:

"Exploring the Magnetism of Electromagnets" Electromagnets and Automatic Control PPT Courseware 2 Review Review 1. What did Oersted's experiment illustrate? 1. There is a magnetic field around a current-carrying conductor; 2. The direction of the magnetic field of the current is related to the direction of the current. 2. What effects of electric current have you learned (known)? ..

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Update Time: 2024-11-21

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 2 industry PPT template

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