"Why can generators generate electricity" PPT courseware of electric motors and generators 3

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"Why can generators generate electricity" PPT courseware of electric motors and generators 3

review review

If the "+" pole of the power supply is connected to the wire, the observed phenomenon is ___________, and if the circuit is disconnected, the observed phenomenon is __________.

1. Understanding generators

Activity 2: Disassemble the generator

Main components of a generator: magnets and coils

2. Explore the phenomenon of electromagnetic induction

Activity 3: Explore the phenomenon of electromagnetic induction

Have you thought about these questions before doing the research experiment?

1. Conditions for generating continuous current:

One is that power is needed; the other is that the circuit needs to be closed.

2. What is a device that can generate and provide electrical energy?

power supply

3. How to know if there is current in the circuit?

Measure with ammeter

Experimental process and phenomenon records

1 The switch is open and the circuit is open, regardless of any movement of the wire

2 The switch is closed, the circuit is open, and the wire remains stationary.

3. The switch is closed, the circuit is open, and some wires only move up and down.

4. The switch is closed, the circuit is open, and some wires only move left and right.

5. The switch is closed, the circuit is opened, and some wires move diagonally left and right.

6 When the switch is closed, the conductor does not move and the magnet moves left and right.

7 Only changes the direction of conductor movement

8 Only changes the direction of the magnetic field

9 Change the direction of movement of the conductor and the direction of the magnetic field at the same time

Analysis and Demonstration

Conclusion: When a part of a conductor in a closed circuit moves to cut magnetic field lines in a magnetic field, an induced current will be generated in the conductor. This phenomenon is called electromagnetic induction.

The direction of the induced current is related to the direction of movement of the conductor's cutting magnetic field lines and the direction of the magnetic field.

1. Only the direction of movement of the conductor cutting magnetic field lines is changed, and the direction of the induced current is changed.

2. Only the direction of the magnetic field is changed, and the direction of the induced current is changed.

3. At the same time, the direction of movement of the conductor cutting magnetic field lines and the direction of the magnetic field are changed, and the direction of the induced current remains unchanged.

Conditions for the generation of induced current:

1. The circuit must be closed;

2. At least part of the conductors in the closed circuit must move in the magnetic field;

3. The direction of movement of the conductor must intersect with the magnetic field lines.

Continue to explore:

1. Can I use coils and bar magnets to conduct experiments on electromagnetic induction phenomena?

2. What factors are related to the size of the induced current?

The size of the induced current is related to the speed of wire cutting, the strength of the permanent magnet, the number of cutting wires, and the effective length of the cutting wires. The size of the induced current has nothing to do with the speed direction of wire cutting.

3. Working principle of generator

The discovery of the phenomenon of electromagnetic induction further revealed the connection between electricity and magnetism, leading to the invention of the generator, which enabled humans to convert mechanical energy into electrical energy.

Generators have become an indispensable tool in our lives.

The world's first generator made by Faraday

Class exercises

1. Which of the following statements is correct:

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

(2) When a conductor performs cutting motion in a magnetic field, it will definitely produce an induced voltage ( )

(3) When a conductor performs cutting motion in a magnetic field, it will definitely generate an induced current.

(4) When a part of a closed conductor performs cutting motion in a magnetic field, an induced current will definitely be generated ( )

2. Judgment:

In the following situations, induced current is generated ( )

3. 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.

4. Which of the following conductor movements can produce induced current ( )

A. A closed circuit makes a motion of cutting magnetic field lines in a magnetic field

B. A section of conductor moves to cut magnetic field lines in a magnetic field

C. A part of the conductor in the closed circuit moves in the magnetic field

D. A part of the conductor in the closed circuit moves in the magnetic field to cut the magnetic field lines.

5. A section of conductor that does not close the circuit moves in the magnetic field to cut the magnetic field lines. but( )

A. Induced voltage will be generated in the conductor; there will be no induced current;

B. Induced current will be generated in the conductor; no induced voltage;

C. There will be no induced voltage or induced current in the conductor;

D. There is both induced voltage and induced current in the conductor.

6. The principle of alternator manufacturing is ( )

A. Magnetic effect of current B. Thermal effect of current

C. Phenomena of electromagnetic induction D. Principle of electromagnet

Summary of this section

1. Understanding generators

Generator consists of stator and rotor

2. Explore the phenomenon of electromagnetic induction

When a part of a conductor in a closed circuit moves in a magnetic field and cuts the magnetic field lines, a current will be generated in the conductor.

The direction of the induced current in the circuit is related to the direction of movement of the conductor cutting magnetic field lines and the direction of the magnetic field.

3. Working principle of engine

Convert mechanical energy into electrical energy using the phenomenon of electromagnetic induction

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Update Time: 2024-09-08

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