"Electromagnet Electromagnetic Relay" Electricity and Magnetism PPT Courseware 5

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 ___.

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Update Time: 2024-11-24

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

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