"Electromagnets and Their Applications" Magnetic Phenomenon PPT Courseware 6

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"Electromagnets and Their Applications" Magnetic Phenomenon PPT Courseware 6

1. Advantages of electromagnets

1. The magnetism of the electromagnet can be controlled by turning the power on and off.

2. The magnetic strength of the electromagnet can be controlled by the size of the current.

3. The magnetic poles (south and north pole) of the electromagnet can be controlled by the direction of the current.

2. Application of electromagnets

1. Electric bell

Applications of electromagnets

Working principle: Close the switch, current passes through the electromagnet, and the magnet generates magnetism to attract the elastic piece, causing the hammer to hit the iron bell to make a sound. At the same time, the circuit is disconnected, the electromagnet loses its magnetism, and the circuit is closed again due to the elasticity of the elastic piece. . The above process is repeated in cycles, and the electric bell continues to make sounds.

2. Electromagnetic concentrator

Working principle: Different minerals have different magnetic properties. A rotating circular electromagnet is used to attract these minerals. Because they receive different magnetic forces, minerals with different magnetic properties can be separated.

3. Electromagnetic crane

Working principle: Place the electromagnet on the lifted iron-containing object and turn on the current. The electromagnet will generate magnetism and pick up the iron object. When putting it down, just cut off the current.

Do it

1. As shown in the figure, when the switch S is closed, the method that can be used to enhance the magnetism of the electromagnet is ( )

A slider P moves to the left B slider P moves to the right

C Reduce the number of turns of the coil D Increase the energization time

2. The operation to enhance the magnetism of the energized solenoid is ( )

A Double the number of turns in the coil

B Change the direction of current

C Reduce the current intensity by half

D Pull out the iron core from the solenoid

practise:

1. The magnetic strength of the energized solenoid is related to _________, _________ and _________, _________.

2. As shown in the figure, when the slider of the sliding rheostat moves to the right, the magnetism in the electromagnet will ________.

3. Connect the electromagnet, sliding rheostat, power supply and switch to form a closed circuit. If the sliding plate of the rheostat is moved to the right, the spring hanging the iron block on the upper end of the solenoid will ( )

A. unchanged B. shortened

C. Stretch D. Unable to judge

4. As shown in the figure, to make the electromagnet have the strongest magnetism, the correct connection method is ( )

A. Connect S1 to 1 and S2 to 3.

B. Connect S1 to 1 and S2 to 4.

C. S1 is connected to 2, S2 is connected to 4

D. S1 is connected to 2, S2 is connected to 3

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For more information about the PPT courseware "Magnetic Phenomenon Electromagnet and Its Application", please click the Magnetic Phenomenon ppt Electromagnet and Its Application ppt tag.

"Electromagnets and Their Applications" Magnetic Phenomenon PPT Courseware 5:

"Electromagnets and Their Applications" Magnetic Phenomenon PPT Courseware 5 Thinking Review 1. What is the difference between electromagnets and ordinary magnets? 2. How can the presence and strength of the magnetism of the electromagnet be controlled? 3. Why is the core of electromagnet made of soft iron? Instead of steel...

"Electromagnets and Their Applications" Magnetic Phenomenon PPT Courseware 4:

"Electromagnets and Their Applications" Magnetic Phenomenon PPT Courseware 4 Apply what you learn 1. The scientist who first discovered the magnetic effect of electric current is: _____. 2. Oersted's experimental explanation: There is a magnetic field around a current-carrying conductor. The direction of the magnetic field and the direction of the current Regarding 3. Magnetic induction of energized solenoid..

"Electromagnets and Their Applications" Magnetic Phenomenon PPT Courseware 3:

"Electromagnets and Their Applications" Magnetic Phenomenon PPT Courseware 3 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 1. Structure: Electromagnetic relay is composed of electromagnetic...

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Update Time: 2024-07-23

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