"Oersted's Discovery" Electromagnet and Automatic Control PPT Courseware

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"Oersted's Discovery" Electromagnet and Automatic Control PPT Courseware

Review the past and learn the new

1. There are _______ around the magnet. The magnetic field is an objectively existing ______. When a small magnetic needle is placed at a point in the magnetic field and comes to rest, the direction pointed by its ____ pole is the direction of the magnetic field at that point.

2. The interaction between magnetic poles occurs through _____. Therefore, although the magnetic field is invisible and intangible, we can use _______ to test its existence.

3. Draw the magnetic field lines around the bar magnet in the picture below.

4. Charged objects have the property of attracting ________; magnets have the property of attracting _______________. Like charges _____ each other, charges of different types _____ each other; magnetic poles with the same name _____ each other, and magnetic poles with different names ____ each other.

Oersted experiment

Place the straight wire parallel to the small magnetic needle

Guide students to observe:

1. What happens when a straight wire is energized?

2. What happens after a power outage?

3. What happens when the direction of the current is changed?

Observation phenomenon:

Close the switch, the small magnetic needle ____________________, instructions ____________________.

Turn off the switch, the small magnetic needle ____________________. The above two instructions ____________________.

Change the direction of the current, and the small magnetic needle deflects in the direction of___________, indicating_________________________.

Conclusion: Like a magnet, a current-carrying conductor also has _________ around it; the direction of the magnetic field is related to ___________.

Expand and extend

1. The first scientist to discover the connection between electricity and magnetism was ( )

A. Oersted B. Faraday

C. Coulomb D. Ampere

2. A student uses the device shown in the picture below to study the connection between electricity and magnetism. Please carefully observe the device\operation and phenomenon in the picture, and then draw a preliminary conclusion.

Comparing the two pictures A and B, we can see that there is a magnetic field around the current-carrying conductor.

Comparing Figures B and C, we can see that the direction of the magnetic field around a current-carrying conductor is related to the direction of the current.

Conduct exploration activity 2 based on the equipment on the table. (In order to increase the magnetism of the solenoid, this experiment will wrap the solenoid around an iron nail)

A. Observe the distribution of iron filings around the energized solenoid

Precautions:

(1) Don’t have too many iron filings and spread them as evenly as possible.

(2) Tap the glass plate lightly.

Phenomenon:_______________.

B. Use the equipment on the table to explore the polarity of the energized solenoid

Place the small magnetic needles at both ends of the energized solenoid and observe the direction of the N pole when the small magnetic needles are at rest.

Change the direction of the current. When the small magnetic needle is stationary, the N pole points to _____ (fill in "change" or "no change").

Explanation: The direction of the magnetic field of the energized solenoid is related to _______.

Right-hand spiral rule (Ampere's rule)

Hold the solenoid with your right hand and bend your four fingers in the same direction as the current in the solenoid. The end pointed by your thumb is the N pole of the solenoid.

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"Oersted's Discovery" Electromagnets and Automatic Control PPT Courseware 3:

"Oersted's Discovery" Electromagnets and Automatic Control PPT Courseware 3 Oersted Experiment Conclusion: 1. There is a magnetic field around the energized wire; 2. The direction of the magnetic field of the current is related to the direction of the current. This phenomenon is called the magnetic effect of electric current. Oersted's experiment shows that: 1. Electric conduction...

"Oersted's Discovery" Electromagnet and Automatic Control PPT Courseware 2:

"Oersted's Discovery" Electromagnets and Automatic Control PPT Courseware 2 Similarities between Electric Phenomenon and Magnetism Phenomenon Electric Phenomenon Charged bodies can attract ________. There are ___ charges and ____ charges in nature. Like charges ____ each other, and dissimilar charges ____ each other. Magnetic phenomena ..

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Update Time: 2024-11-23

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 2 industry PPT template

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