"Properties of Electromagnets" Magical electromagnet PPT courseware

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"Properties of Electromagnets" Magical electromagnet PPT courseware

Review: Basic properties of permanent magnets:

1. It is magnetic and can absorb iron products;

2. There are South and North Pole; the South Pole is represented by the letter S, and the North Pole is represented by the letter N.

3. Different poles attract each other, and like poles repel each other.

Definition of electromagnet:

The device consisting of a coil and an iron core is called an electromagnet.

Things to note when making iron nail electromagnets

1. During production, the insulated wires should be wound around the iron core in the same direction;

2. Since the circuit will be short-circuited after the power is turned on, the wires will heat up, and the battery life will be affected, so the power supply cannot be turned on for a long time after the production is completed.

Will the electromagnet be magnetic like a magnet and attract iron products?

Test the magnetism of the electromagnet

Electromagnet generates magnetism when energized

When the electromagnet is disconnected, the electromagnetism disappears

summary:

1. What is an electromagnet?

Such a device consisting of a coil and an iron core is called an electromagnet

2. Properties of electromagnet: (1)

Electromagnet generates magnetism when energized

When the electromagnet is disconnected, the electromagnetism disappears

electromagnet north and south poles

Do electromagnets have north and south poles?

My guess:

1. How to check whether the electromagnet has north and south poles?

(1) First look at the properties of permanent magnets

Like poles repel each other

Opposites attract each other

2. What factors are related to the north and south poles of the electromagnet?

Guess: Please see what is the difference between the two electromagnets below?

Coil winding directions are different

Electromagnet properties (2):

The north and south poles of the electromagnet can be changed

(1) Depends on the winding direction of the coil

(2) It is related to the connection method of the battery (positive and negative poles)

Changing the winding direction of the coil will change the north and south poles.

Changing the connection method of the battery (positive and negative poles) will also change the north and south poles.

Summary of this lesson:

1. What is an electromagnet?

A device composed of a coil and an iron core is called an electromagnet

2. Precautions for making iron nail electromagnets:

Use insulated wire; wrap in the same direction.

3. Properties of electromagnets:

(1) The electromagnet ( ) generates magnetism, and ( ) the magnetism disappears.

(2) The electromagnet has north and south poles, and the north and south poles meet ( ).

Change the direction of ( ), and the North and South Pole will change.

Change ( ) The North and South Pole will change

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"Properties of Electromagnets" Magical Electromagnet PPT Courseware 2:

"Properties of Electromagnets" Magical Electromagnet PPT Courseware 2 Review Questions 1. The experiment shown in the picture is called _______ experiment, which illustrates _______________; this phenomenon is called the magnetic effect of current 2. The external force of the energized solenoid The magnetic field is similar to that of a _____ magnet..

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Update Time: 2024-11-21

This template belongs to science courseware People's Education Press Fourth Grade Science Volume 2 industry PPT template

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