"Scientific Inquiry: How to Generate Induced Current" Where Does Electricity Come from PPT Courseware 2

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"Scientific Inquiry: 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. Conjecture:

When a coil rotates in a magnetic field, it produces an electric current, which may be related to ____________.

3. Explore the conclusion: The conditions for a conductor to generate current in a magnetic field: the conductor is a part of ______; the conductor moves along the ______ magnetic field lines. The direction of current is related to both the ______ direction and the ______ direction.

4. Electromagnetic induction: The phenomenon that current is generated when some conductors of a ______ circuit do ____________ in a magnetic field is called electromagnetic induction. The current generated in electromagnetic induction is called induced current. After 10 years of unremitting exploration, British scientist ______ finally discovered the phenomenon of electromagnetic induction in 1831.

5. Energy conversion: In the phenomenon of electromagnetic induction, ____________ energy is converted into ______ energy.

6. Applications of electromagnetic induction phenomena: ______, ______ (microphone).

2. Generator

1. Principle: Made according to the ____________ principle.

2. Structure: composed of ____________, ____________, ____________, ____________, etc.

3. Energy conversion: When the generator works, it converts the ____________ energy of the rotor rotation into ____________ energy.

1. Electromagnetic induction

To correctly understand the conditions for generating induced current, we need to pay attention to three situations: (1) The conductor must be cutting the magnetic field lines. The so-called cutting of magnetic induction lines is similar to cutting vegetables. It can be cut vertically or diagonally. "Motion of cutting magnetic field lines" refers to the relative movement of conductors and magnetic fields. (2) A part of the conductor must move to cut the magnetic field lines. If all the closed circuit moves to cut the magnetic field lines in the magnetic field, no induced current will be generated in the conductor. (3) The circuit must be closed. If the circuit is not closed, no induced current will be generated, but only an induced voltage will be generated at both ends of the conductor.

2. Working principle of generator

(1) Principle: The generator is made based on the phenomenon of electromagnetic induction.

(2) Structure: Generators are composed of two parts: the rotor (rotating part) and the stator (fixed part). A generator with fixed magnetic poles and rotating coils is called a rotating armature generator, and a generator with fixed and rotating magnetic poles is called a rotating magnetic pole generator. In order to obtain a stronger magnetic field, rotating magnetic pole generators use electromagnets instead of permanent magnets. magnet.

Knowledge point 1 Induced current

1. Every major discovery made by scientists in the field of physics has effectively promoted the process of human civilization. The earliest scientist who used magnetic fields to obtain electric current to push mankind into the electrification era was ()

A. Newton B. Oersted

C. Torricelli D. Faraday

2. As shown in the figure are four pictures for studying the phenomenon of electromagnetic induction. The arrows indicate the direction of movement of the conductor. What can produce induced current is ()

3. Which of the following devices works using the principle of electromagnetic induction ()

A. Motor B. Hair dryer C. Microphone D. Speaker

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"Scientific Inquiry: How to Produce Induced Current" Where Does Electricity Come from PPT Courseware 3:

"Scientific Inquiry: How to Generate Induced Current" Where Does Electricity Come from PPT Courseware 3 Scenario 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..

"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: 2024-07-04

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

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