"Scientific Inquiry: How to Generate Induced Current" Where Does Electric Energy Come from PPT Courseware 3

Description

"Scientific Inquiry: How to Generate Induced Current" Where Does Electric Energy Come from PPT Courseware 3

Situation introduction

After Oersted discovered the magnetic effect of electric current, many scientists were thinking: Since electric current can produce magnetism, can magnetism produce electricity?

Faraday was born in Salisbury, England in 1791. Due to his poor family, his childhood was very difficult. When Faraday was a child, he learned simple calculations of addition, subtraction, multiplication and division under the guidance of his father. At the age of thirteen, he went to a bookstore to learn how to staple books and became a book stapler. This period of time had a profound impact on his life. Faraday's achievements in electricity are primarily due to the two laws and the invention of the generator.

1. Experimental Investigation: Electromagnetic Induction Phenomenon

Explore under what circumstances magnetism can generate electricity

Make up the above circuit and make various attempts to see if it can generate current? If not, what might be the reason?

It may be that the current is too small or the method is incorrect.

In conclusion

1. Conditions for generating induced current:

A. Circuit closure

B. Part of the conductor

C. The conductor moves to cut the magnetic field lines

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

3. In the phenomenon of electromagnetic induction, mechanical energy is converted into electrical energy.

Generator vs Electric Motor Comparison

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

2. The motor consumes electrical energy and outputs mechanical energy; the generator consumes mechanical energy and outputs electrical energy.

3. Electric motor: Utilizes the principle of energized coil rotating in a magnetic field

Generator: Using the principle of electromagnetic induction

It can be divided into two categories: AC generator and DC generator.

Knowledge sorting

basic concept:

(1) The phenomenon of electric current generated due to the movement of a conductor in a magnetic field is called ________ phenomenon.

(2) The current generated in the phenomenon of electromagnetic induction is called _______.

(3) A current that changes direction and size periodically is called alternating current, or AC for short.

(4) In alternating current, the number of times the current changes periodically per second is called frequency.

The unit of frequency is _______ and its symbol is _______.

Basic rules:

(1) The conditions for generating induced current are: ______________; ______________.

(2) The generator is made according to _______. The essence of generator power generation is the process of converting _______ into electrical energy.

Practice in class

1. The conditions for generating induced current are ( )

A. A conductor moves in a magnetic field

B． A conductor moves in a magnetic field cutting magnetic field lines

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

D． A closed conductor moves in a magnetic field cutting magnetic field lines

2. Judgment: Which of the following conditions will produce induced current?

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

4. The direction of the induced current is related to ____________ and ____________.

5. The current that changes ____ periodically is called alternating current, the _____ constant current is called direct current, the generator provides _____ electricity, and the battery provides __ electricity

6. The rotor of our 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.

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"Scientific Exploration: How to Generate Induced Current" Where Does Electric Energy Come from PPT Courseware 2:

"Scientific Exploration: How to Generate Induced Current" Where Does Electricity Come from PPT Courseware 2 1. Explore how to generate induced current 1. The structure of the generator model: There is a ______ ( ) that can generate a magnetic field and a ______ that can rotate in the magnetic field. ( ). 2. Guess: Coil..

"Scientific Exploration: How to Generate Induced Current" Where Does Electricity Come From PPT Courseware:

"Scientific Inquiry: How to Generate Induced Current" Where Does Electricity Come From PPT Courseware Review: Oersted's experiment shows that there is a magnetic field around a current-carrying conductor. The direction of the magnetic field of the current is related to the direction of the current. Oersted's experiment proved that electric current can produce magnetism, that is, the magnetic effect of electric current. become..

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Update Time: 2024-10-20

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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