"Why Generators Can Generate Electricity" PPT Courseware on Electric Motors and Generators 2

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"Why Generators Can Generate Electricity" PPT Courseware on Electric Motors and Generators 2

Get to know generators

Look carefully at the hand-cranked generators shown in the picture below. What are the main components inside them? Compare the structures of generators and electric motors and see what similarities they have.

The main components of a generator are: magnet (stator) and coil (rotor)

Explore the phenomenon of electromagnetic induction

A generator is similar to an electric motor and its main components are magnets and coils. Following the study of electric motors, we simplify them and use experiments to explore how generators produce electric current.

Oersted's experiment (electromagnetism)

Magnetism generates electricity?

A current-carrying conductor experiences a force in a magnetic field

Will electricity be generated when a conductor subjected to a force moves in a magnetic field?

Conduct experiments and collect evidence

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.

Analysis and Demonstration

Conclusion: When a part of a conductor in a closed circuit moves to cut the 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.

think about it

What does it mean when the pointer of the ammeter swings left and right?

Experiments show

1. When a part of a conductor in a closed circuit moves to cut magnetic field lines in a magnetic field, a current is generated in the conductor.

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

3. The size of the induced current is related to the strength of the magnetic field and the speed at which the conductor cuts the magnetic field lines.

Class exercises

1. Generators are all made using the ___________ principle, and the energy conversion relationship is ___________ into ______.

Thermal power _____conversion_____

Nuclear power plant _____ conversion _____

Hydropower_______conversion_____

Wind power _____conversion_____

2. Electromagnetic induction phenomenon: When a part of a conductor in a closed circuit undergoes __________ motion in a magnetic field, an electric current is generated in the conductor.

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

4. In April 1820, the Danish physicist ________ discovered the phenomenon of "electromagnetism"; in 1831, the British physicist Faraday discovered the __________ phenomenon, realizing "magnetism generates electricity".

5. After 10 years of exploration, the British physicist Faraday discovered the phenomenon that electric current can be generated by using a magnetic field. The following methods take advantage of this phenomenon: ( )

A. Electric motor b. Electromagnetic crane

C. steam engine d. dynamo

extracurricular activities

1. Connect a sensitive galvanometer to the plug of a micro fan and rotate the blades by hand. What phenomenon do we see? What does this mean?

The needle of a sensitive galvanometer will deflect, indicating that a current is being produced.

2. Dynamic microphone is an example of applying electromagnetic induction.

The diaphragm of a dynamic microphone is fixed to a coil, which is placed on a magnet. When you speak into the microphone, the sound waves vibrate the diaphragm, and the diaphragm drives the coil to vibrate together, so a current that changes with the sound is generated in the coil.

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Update Time: 2024-10-01

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

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