"Magnetism Generates Electricity" PPT

Description

"Magnetism Generates Electricity" PPT

Part One: Introduction of New Courses

After 10 years of research, the British scientist Faraday discovered the conditions and laws of magnetic electricity generation in 1831, and realized his desire to use magnetic fields to obtain electric current (magnetic electricity generation).

Significance: It has led to the large-scale production and utilization of electric energy and opened up a new era of electrification.

Explore: How to obtain current from a magnetic field?

Ask a question

How is electricity produced by a "conductor moving in a magnetic field" and a "moving magnet"?

Guess or hypothesis What equipment is needed?

Experimental exploration

①What equipment is the most convenient to obtain a magnetic field?

②What equipment should be used to easily measure the current?

③What equipment is needed to connect the ammeter to the circuit?

Magnetism generates electricity PPT, part 2 content: Classroom problems

Question: When I was doing the experiment just now, the pointer of the sensitive ammeter deflected left and right. What does it mean?

Take a guess

What factors do you think might be related to the direction of the induced current in the circuit?

It may be related to the direction in which the conductor cuts the magnetic field lines (the direction of conductor movement)

It may be related to the direction of the magnetic field

Magnetism generates electricity PPT, Part 3: Classroom examples

1: Which of the following four figures will not produce induced current ( )

(The small circle in the picture represents a part of the closed conductor)

2. When a conductor cuts magnetic field lines in a magnetic field, ___________ will occur at both ends of the conductor.

3. The direction of the induced current is related to __________ and ___________.

4. In the phenomenon of electromagnetic induction, when the conductor cuts the magnetic field lines and moves, ____________ is produced.

It can be seen that in the phenomenon of electromagnetic induction, ______ energy is converted into ______ energy.

5. Please judge:

(1) When a conductor moves in a magnetic field, it will definitely produce an induced current ( )

(2) When a conductor cuts magnetic field lines in a magnetic field, it will definitely produce an induced voltage ( )

(3) When a closed conductor cuts magnetic field lines in a magnetic field, it will definitely generate an induced current ( )

(4) When a part of a closed conductor cuts the magnetic field lines in a magnetic field, it will definitely produce an induced current ( )

Magnetism generates electricity PPT, part 4 content: exercises:

1. The conditions for generating induced current are: circuit ______, and part of the wire is ____________.

2. When a conductor cuts magnetic induction lines in a magnetic field, there must be ____________. There may not necessarily be ______ produced. If the circuit is closed, there must also be ______.

3. As shown in the figure, the magnetic field, the conductor cutting direction and the direction of the induced current have been marked in Figure A. Please mark the current directions in the four figures B, C, D and E.

Magnetism generates electricity PPT, Part 5: Three major relationships between electricity and magnetism (three major principles)

1. Electric current can produce magnetic field (electromagnetism)

2. The magnetic field exerts a force on the current

3. Use a magnetic field to obtain electric current (electromagnetic induction)

(Magnetic electricity)

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, magnetic electricity PPT download, .PPT format;

For more information about the PPT courseware "Magnetism Generates Electricity", please click the Magnetism Generates Electricity ppt tab.

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Update Time: 2024-08-28

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