"Applications of Electromagnets" Magical Electromagnet PPT Courseware 3

Description

"Applications of Electromagnets" Magical Electromagnet PPT Courseware 3

1. What is an electromagnet?

1.Definition:

An electromagnet is an energized solenoid with an iron core.

2.Construction:

coil core

2. Electromagnet:

1. Design a simple electromagnet and think about the following questions:

(1) How do you prove that your electromagnet is magnetic?

(2) How do you control the magnetism of the electromagnet?

Can be controlled by turning the current on and off

(3) Can you control the magnetic strength of the electromagnet?

Control by changing the size of the current and the number of turns of the coil

(4) Can you change the polarity of the magnetic poles of an electromagnet?

The polarity of its magnetic poles can be changed by changing the direction of the current

Electromagnetic crane

Working principle: When the current is turned on, the electromagnet generates magnetism and picks up the iron object. When putting it down, just cut off the current.

Discussion: Based on the principle of electromagnets, explain the working principle of electromagnetic cranes.

Electromagnetic concentrator

Working principle: Different minerals have different magnetic properties. These minerals are attracted by electromagnets and receive different magnetic forces, so that different minerals can be separated.

Discussion: Based on the principle of electromagnet, explain the working principle of electromagnetic concentrator.

Where is the iron ore between A and B?

Advantages of electromagnetic relays

1. The use of electromagnetic relays can control high voltage and high current with low voltage and low current. This prevents people from directly contacting and manipulating high-voltage and high-current switches, which may cause danger!

2. Automated control (automatic water level alarm, automatic temperature control box)

3. Remote control (when the workplace temperature is high or the environment is harsh)

magnetic levitation train

1. Do you know which city opened my country’s first maglev train?

2. Do you know which maglev high-speed railways between two cities are currently under preparation? How long does it take to travel one way?

Working principle: The repulsive or attractive force between the magnetic poles of the strong electromagnet on the train track and the magnetic poles of the electromagnet on the train makes the train levitate, eliminating friction, reducing resistance and increasing running speed.

Magnetic recording of information:

Principle: One side of the tape that records sound, text, images and other information is coated with a layer of magnetic powder. Each magnetic powder particle is a small magnet. The magnetic powder is magnetized through the magnetic head and the information is recorded on the tape.

Self-Summary: What knowledge have you mastered from studying this lesson?

Homework assignment:

1. Read the introduction to telephone on page 113 of the textbook.

2. Complete the assignments in the homework book

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For more information about the PPT courseware "Applications of Electromagnets and Magical Electromagnets", please click on the Applications of Electromagnets ppt Magical Electromagnets ppt tag.

"Applications of Electromagnets" PPT:

"Applications of Electromagnets" PPT Part One: Electromagnets Electromagnets: energized solenoid with an iron core inside. The working principle of electromagnet: It works by using the magnetic effect of electric current. 1. The electromagnet is a _________ with ________. 2. The electromagnet...

"Applications of Electromagnets" Magical Electromagnet PPT Courseware 2:

"Applications of Electromagnets" Magical Electromagnet PPT Courseware 2 Creation Scenario Electromagnets are widely used in production and life: such as: electromagnetic lifting, electromagnetic concentrators, telephones, electric bells, electromagnetic relays, etc. Knowledge point 1: Electromagnetic relay Electromagnetic relay 1. Structure:..

"Applications of Electromagnets" Magical electromagnet PPT courseware:

"Application of Electromagnets" Magical Electromagnet PPT Courseware Consolidation 1. Mark the N and S poles of the energized solenoid in the picture on the right, and mark the positive and negative poles of the power supply. 2. To make the magnetic poles of the electromagnet look like the picture on the right, please connect the two endpoints a and b of the wire to the two poles of the power supply. ..

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Update Time: 2024-11-14

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

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