"Conductors and Insulators" Electrical PPT Courseware 3

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"Conductors and Insulators" Electrical PPT Courseware 3

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Why are the inner cores of wires made of metal wire?

Why should the wire sheath be covered with a layer of plastic skin or rubber?

Objects that easily conduct electricity are called conductors.

Objects that do not conduct electricity easily are called insulators.

test you

1. What is usually a conductor ( )

A.Iron ceramic glass B.paper oil earth

C. plastic dry wood rubber D. silver human body earth

2. Under normal circumstances, which of the following objects is an insulator ( )

A. Chalk B. Iron wire C. Salt water

Knowledge link

What should you do if you find someone has been electrocuted?

1. The key is to get him out of the power supply as soon as possible so that he will no longer be harmed by the current.

2. Never pull him with your hands, otherwise you will get an electric shock yourself.

3. If you are indoors, you can immediately close the electric door and sliding door box, and use dry wooden sticks, bamboo poles or other equipment with wooden handles to unplug the wires. If possible, you can use electrical insulating pliers or wooden pliers. Ax, to cut or chop wires.

4. If an electrocuted person falls on a leaking machine and the current cannot be disconnected for a while, you can wear rubber shoes or cloth shoes and stand on a dry wooden stick to move the electrocuted person away from the electrified machine.

5. After the person who gets an electric shock is disconnected from the power supply, he should be sent to the hospital for treatment immediately.

after class homework

Short answer:

Why do the core wires of electric wires use metal wires, while the outer sheaths use plastic or rubber skins?

Classroom extension

In addition to conductors and insulators, there are also superconductors and semiconductors in life. Please go online after class to search for relevant knowledge about superconductors and semiconductors and communicate with each other.

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For more information about the "Electrical Conductors and Insulators" PPT courseware, please click on the Electrical ppt Conductors and Insulators ppt tab.

"Conductors and Insulators" PPT download:

"Conductors and Insulators" Electric PPT Download Part One: Introduction of New Knowledge Use the following three methods to connect the detection head and observe whether the small light bulb will light up. (1) Connect the two plastic skins together (2) Connect the metal head and the plastic skin together (3) Connect the two metal heads...

"Conductors and Insulators" Electrical PPT:

"Conductors and Insulators" Electricity PPT Part One Content: Detecting whether the objects around us are conductive. Among the objects around us, some are easy to conduct electricity and some are not. How can we know the conductivity of objects? How to test whether a piece of rubber is conductive? ..

"Conductors and Insulators" PPT courseware:

Hunan Education Edition fifth grade science volume 1, conductors and insulators PPT courseware, the first part of the content: circuit detector circuit detector 1. Why does the small light bulb light up? 2. What will happen if you cut off the wires in the circuit and why? 3. Is there any way to reconnect...

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Update Time: 2024-11-20

This template belongs to science courseware Fourth Grade Science Volume 2, Textbook Edition industry PPT template

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