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Authoritative PPT Summary
"Conductors and Insulators" Electrical PPT Courseware 3
Explore
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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