"Application of Electromagnet" PPT

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"Application of Electromagnet" PPT

Part One: Electromagnet

Electromagnet: An energized solenoid with an iron core inside.

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

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.

PPT on the application of electromagnets, part 2: 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 magnet'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

Application of electromagnets PPT, part 3: Advantages of electromagnets:

1. The presence or absence of magnetism can be controlled by turning the power on and off.

2. The strength of the magnet can be controlled by changing the size of the current and the number of turns of the coil.

3. Its magnetic poles can be controlled by changing the direction of the current.

Application of electromagnets PPT, part 4: electromagnetic relays

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 generate ____________, 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:

1. Use the method of controlling the ______ voltage______ current circuit on and off to indirectly control the ______ voltage______ current circuit on and off.

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

PPT on the application of electromagnets, part 5: feedback exercises

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 the _____ state (fill in "tension" ” or “compression”).

3. What electromagnetic relays and speakers have in common is that their main components are _____.

Keywords: Free download of science PPT courseware for the second volume of the eighth grade of Zhejiang Education Edition, PPT download of the application of electromagnets, .PPT format;

For more information about the "Applications of Electromagnets" PPT courseware, please click the "Applications of Electromagnets" ppt tab.

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Update Time: 2024-11-15

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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