"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 6

Description

"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 6

learning target

1. Know what an electromagnet is and what its advantages are.

2. Understand the factors that affect the magnetic strength of electromagnets and be able to apply them simply

3. Know the application of electromagnets in daily life and production

4. Know the structure and working principle of electromagnetic relays

5. Be able to explain the working process of electromagnetic relays

6. Know the application of electromagnetic relays in life

(1) Study the magnetic properties of electromagnets

Experiment: On and Off Switches

Phenomenon: The electromagnet ___________ when energized

Electromagnet _______________ during power outage

Conclusion: The electromagnet is ___magnetic when energized, and _____ when deenergized.

(2) Study the relationship between the magnetic strength of the electromagnet and the magnitude of the current

Experiment: change the size of the current

Phenomenon: When the current is increased, the number of pins attracted by the electromagnet is _____.

Conclusion: The more _____ the current passes through the electromagnet, the more _____ the electromagnet's magnetism.

(3) Study the relationship between the magnetism of the electromagnet and the number of coil turns

Experiment: Changing the number of turns in the coil

Phenomenon: The more _____ the number of turns, the more _____ the magnetism.

Conclusion: When the current is constant, the number of turns of the electromagnet coil is ______, and the magnetism is ______.

Experimental results:

The electromagnet is ____magnetic when it is energized, and it is ______ when it is powered off. The greater the current passing through the electromagnet, the magnetic ______ of the electromagnet. When the current is constant, the more turns the electromagnet coil has, the magnetic ______.

Advantages of electromagnets:

Whether the electromagnet is magnetic or not can be controlled by ________;

The magnetic strength of the electromagnet can be controlled by __________;

The polarity change of the electromagnet can be achieved by ____________.

Fill it out

Working principle: When switch S1 is closed, the electromagnet is energized to produce _____, which ______ the armature, the contact of switch S _____, the working circuit has _____ passing through, and the motor starts to rotate.

The function of the electromagnetic relay: Use low voltage and weak current (control circuit) to control high voltage and strong current (working circuit).

Because of this, electromagnetic relays can (1) remotely control (2) automatically control (3) safety alarm...

The essence of electromagnetic relay:

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

Learn to read the instructions for electromagnetic relays

Classroom training

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 current in the circuit will ______ and the magnetism in the electromagnet will _______.

3. 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

4. As shown in the figure, if the slider of the rheostat is moved to the right, the spring of the hanging magnet will ( )

A. unchanged B. shortened

C. Stretch D. Unable to judge

5. Electromagnetic relays can be used to indirectly control the working circuits of _______ and _______ using ________ and _______ circuits.

6. Electromagnetic relays are mainly composed of ________, ________, _______, and _______.

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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.

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Update Time: 2024-11-15

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

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