"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 4

Description

"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

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.

guess

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.

4. Electromagnetic relay

1. Electromagnetic relay

An electromagnetic relay is a switch that uses electromagnets to control a working circuit.

2. The structure of electromagnetic relay

3. Working principle of electromagnetic relay

practice

1. The picture is a schematic diagram of an automatic water level alarm. Try to explain how it works.

2. The picture is a schematic diagram of an automatic temperature alarm. To make a mercury thermometer, a piece of metal wire is sealed in a glass tube. When the temperature reaches the temperature indicated by the lower end of the metal wire, the bell will sound and an alarm signal will be sent. Explain how it works.

3. The picture shows the schematic diagram of a DC bell. B is the armature and A is the elastic piece. Try to explain how it works.

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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 3:

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 3 1. What is an electromagnet? 1. Definition: An electromagnet is an energized solenoid with an iron core. 2. Structure: coil iron core 2. Electromagnet: 1. Design a simple electromagnet and think about the following questions:..

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Update Time: 2024-11-20

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

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