People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
Shanghai Science Edition Ninth Grade Physics
People's Education Edition Physics for Grade 8, Volume 1
Shanghai Science Edition 8th Grade Physics
Beijing Normal University eighth grade physics volume one
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University Ninth Grade Physics Volume 1
Lu Jiao Edition Ninth Grade Physics Volume 2
Lu Ke Edition High School Physics Compulsory Course One
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
People's Education Press High School Physics Compulsory Course II
Guangdong and Shanghai version of eighth grade physics volume 2
Beijing Normal University Ninth Grade Physics Volume 2
Lu Jiao Edition Eighth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 2
!["Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 5](http://daogebangong.oss-cn-beijing.aliyuncs.com/ppt/preview/1/4bc384a8-0d34-4ac4-91fc-55e5f1061068.webp)
Category | Format | Size |
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People's Education Edition Ninth Grade Physics Complete Book | pptx | 6 MB |
Description
"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.
2. Magnetic properties of electromagnets
Design experimental plan
1. How to change the size of the current passing through the electromagnet?
2. How to change the number of turns of the electromagnet coil?
3. How to judge the magnetic strength of an electromagnet?
4. How to design the circuit?
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?
Method to judge the strength of magnetism: (conversion method)
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;
(3) Insert the iron core into the solenoid.
4. Exchange experimental results
When the number of turns of the electromagnet coil is constant, the greater the current passing through the electromagnet coil, the stronger the magnetism of the electromagnet;
When the current passing through the electromagnet coil is constant, the more turns the electromagnet coil has, the stronger the magnetism of the electromagnet;
Inserting an iron core increases the magnetism of the coil;
Advantages of electromagnets:
1. The presence or absence of magnetism can be used to control current on and off.
2. The strength of the magnet can be controlled by changing the size of the current, the number of turns of the coil, and whether there is an iron core.
3. Its magnetic poles can be controlled by changing the direction of the current.
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. As shown in the figure, when the sliding blade of the sliding rheostat moves to the right, the magnetism in the electromagnet will ____.
The function and essence of electromagnetic relay:
1. Use the on-off of ___ voltage___ current circuit to indirectly control the on-off of ___ voltage___ current circuit.
2. The essence of an electromagnetic relay is a kind of ___ that uses ___ to control the on and off of the working circuit.
feedback exercise
1. The structure of the electromagnetic relay is as shown in the figure on the right, where A is ___, B is ___, and C is ___. It uses ___ to suck and release the armature instead of a switch to control the on and off of the circuit.
2. The electromagnet of the electromagnetic relay is connected in the ___ circuit, and its moving contacts and static contacts are connected in the ___ circuit. The hard rod between the armature and the movable contact should be ___ (fill in "conductor" or "insulator"). It forms a lever together with the armature and movable contact, and the spring is always in ___ state (fill in "tension" ” or “compression”).
3. The main component of the electromagnetic relay is ___.
Keywords: electricity and magnetism teaching courseware, electromagnet electromagnetic relay teaching courseware, NEP version ninth grade physics PPT courseware, ninth grade physics slide courseware download, electricity and magnetism PPT courseware download, electromagnet electromagnetic relay PPT courseware Download, .ppt format
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 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..
"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: 2024-09-08
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