"Magnetism Generates Electricity" Electricity and Magnetism PPT Courseware 2

Description

"Magnetism Generates Electricity" Electricity and Magnetism PPT Courseware 2

practise:

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 ______.

Alternator principle - electromagnetic induction

When a rectangular coil in a closed loop rotates continuously in a magnetic field, an induced current with constantly changing directions is generated in the coil.

Actual alternator (rotating magnetic field type)

1. Composition:

Stator - coil; rotor - electromagnet

Reason: The coil has many turns, the wire is very thick, and it rotates at high speed

Difficult; strong magnetic fields can be obtained using electromagnets

2. Application:

Power machine: water turbine, steam turbine (nuclear power plant), internal combustion engine, steam turbine (thermal power plant), etc.

Get to know my country’s alternating current:

Period: 0.02 seconds, Frequency: 50 Hertz (Hz)

That is, the direction of the current changes 100 times per second.

writing on the blackboard:

Cycle of alternating current:

The time it takes for alternating current to complete a periodic change.

Frequency of alternating current:

The number of cyclic changes in alternating current within one second.

Electric motor vs generator comparison

1. In principle, the structure of the generator is exactly the same as that of the electric motor.

2. The electric motor consumes electrical energy and outputs mechanical energy (converts electrical energy into mechanical energy);

Generators consume mechanical energy and output electrical energy.

practise

1. The current that changes ____ periodically is called alternating current, and the current that does not change _____ is called direct current. The generator provides _____ electricity, and the battery provides __ electricity.

2. The rotor of my country's alternator rotates ____ times per second, that is, the changing frequency of the alternating current is ____ Hz, so the direction of the alternating current changes ___ times per second.

3. The main structure of a generator is divided into two parts: ____ and ____. The coil of a large generator is _____, and the electromagnet is _____.

4. The principle of alternator manufacturing is ( )

A The magnetic effect of electric current B The magnetic phenomenon of electric current

C Phenomena of electromagnetic induction D Principle of electromagnet

5. The frequency of the alternating current used in our country is 50 Hz, and the direction of the current changes within 10 seconds ( )

A. 500 times B. 50 times

C. 100 times D. 1000 times

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

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Update Time: 2024-06-28

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

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