"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 2

Description

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 2

Electromagnet: An energized solenoid with an iron core inside.

The working principle of electromagnets: they work by using the magnetic effect of current

1. Electromagnet

1. An energized solenoid inserted into an iron core is called an electromagnet.

2. It is magnetic when there is current flowing through it and loses its magnetism when there is no current.

3. Working principle of electromagnet: It works by using the magnetic effect of electric current.

2. Magnetic properties of electromagnets

Question: What factors are related to the magnetic size of electromagnets?

The application of current magnetic effect should be related to the size of the current.

The coil is the main component, which should be related to the shape and number of turns of the coil.

The strength of the magnet may be related to the size of the current, the number of turns and the shape of the coil.

design experiment

For solenoids with the same appearance, what is the relationship between the magnetic strength of the electromagnet and the number of turns of the coil?

How to judge the strength of magnetism:

The magnetic strength of the solenoid can be judged by the number of nails, paper clips, etc. it attracts.

(1) Change the current in the circuit;

(2) Replace the solenoid with a different number of turns.

practice

1. When the number of turns of the electromagnet coil is constant, the greater the ___ passing through the electromagnet, the stronger the magnetism of the electromagnet; when the current passing through the electromagnet coil is constant, the more ___ the electromagnet has, the stronger the electromagnet's magnetism. The stronger the magnetism;

2. Advantages of electromagnets:

A. The presence or absence of magnetism can be controlled by _______.

B. The strength of the magnet can be controlled by changing the size of ____ and the ____ of the coil.

C. Its magnetic poles can be controlled by changing ________.

3. Which of the following methods can enhance the magnetism of electromagnets ( )

A. Increase the current in the solenoid

B． Reduce the number of turns of the solenoid

C. Increase the energization time of the electromagnet

D. Changing the direction of current in a solenoid

4. Electromagnetic relay

1. Structure and components of electromagnetic relay

The function of the main parts:

Electromagnetic iron: generates magnetism when energized and attracts the armature

Armature: connected with the movable contact, driving the movable contact to move up and down

Spring: When the magnetism of the electromagnet disappears, it drives the armature to spring away from the electromagnet.

Contact: equivalent to the switch of the controlled circuit

2. Working principle of electromagnetic relay:

Working principle: When switch S1 is closed, the electromagnet is energized to produce ______, which sucks ______ down. The contact of switch S _____. When _____ passes through the working circuit, the motor starts to rotate.

The function and essence of electromagnetic relay:

3. Use the method of controlling the ____ voltage ____ current circuit on and off to indirectly control the ____ voltage ____ current circuit on and off.

4. The essence of an electromagnetic relay is a switch that uses ____ to control the on and off of the working circuit.

Summary

1. An electromagnet is a ______________ with a _______.

2. The magnetic strength of the electromagnet is related to _______, ______________, and _______

3. The working principle of electromagnets: using the magnetic effect of electric current.

4. Applications of electromagnets: electromagnetic cranes, electromagnetic relays, electric bells, etc.

5. What are the advantages of electromagnets?

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For more information about the PPT courseware "Electricity and Magnetism Electromagnet Electromagnetic Relay", please click the Electricity and Magnetism ppt Electromagnet Electromagnetic Relay ppt tag.

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 6:

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 6 Learning Objectives 1. Know what an electromagnet is. Know the advantages of electromagnets. 2. Understand the factors that affect the magnetic strength of electromagnets and be able to apply them simply. 3. Know the role of electromagnets in daily life. and application in production 4. Know electricity..

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 5:

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 5 1. Electromagnet 1. An energized solenoid inserted into an iron core is called an electromagnet. 2. Working principle of electromagnet: It uses the magnetic effect of electric current to work 3. It is magnetic when there is current flowing through it and loses its magnetism when there is no current. ..

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 4:

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 4 1. Electromagnet Coil Core 1. An energized solenoid inserted into an iron core is called an electromagnet. 2. It is magnetic when there is current flowing through it and loses its magnetism when there is no current. 2. Magnetic properties of electromagnets Problems Magnetic properties of electromagnets..

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Update Time: 2024-10-02

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

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