"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 4

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"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 4

Take a guess

Metal wires, plastic rulers, glass rods, pencil leads (carbon rods), salt water, chalk, coins, which materials are easy to conduct electricity? Which substances do not conduct electricity easily?

Circuit Exploration: The Conductivity of Materials

discuss

1. What method can be used to show or explain that there is current flowing through the circuit?

2. Under what circumstances will current occur in the circuit?

If I want to test the conductivity of a substance, can you help me design a simple experiment and draw a circuit diagram:

Objects that easily conduct electricity are called conductors.

For example: metal, human body, earth, graphite

Objects that do not conduct electricity easily are called insulators.

Examples: plastic, wood, rubber, glass, dry air

Why do conductors conduct electricity?

Circuit Exploration: The Conductivity of Materials

Glass at room temperature is an insulator, but when it is heated red, it becomes a conductor.

Pure water is an insulator, and water containing impurities is often a conductor.

Dry air is an insulator, and moist air under high pressure is a conductor.

Conclusion: There is no absolute boundary between conductors and insulators, and they can transform into each other under certain conditions.

Semiconductor's Readme

My name is a semiconductor, I have a brother called a conductor, and a brother called an insulator. My conductive ability is somewhere between a conductor and an insulator. Common materials I use are germanium and silicon. I have many unique conductive properties and have been widely used in electronic technology and radio engineering. Now you know something about me, don't say you don't know me in the future.

test you

1. When you find someone getting an electric shock, what should you do to separate the wires?

2. In thunderstorm weather, is it better to hold the umbrella with your hand on the handle or the umbrella pole?

3. Do all conductors have the same conductivity?

How to design experimental verification?

Substances with electrical conductivity between conductors and insulators are called semiconductors

Semiconductors have a small amount of free charge

Common semiconductor materials include germanium and silicon, which have important applications in electronics and radio technology.

summary:

The reason metal conductors conduct electricity: there are a large number of free electrons

The reason why a conductor conducts electricity is because it has a large amount of free charge

The reason why insulators do not conduct electricity easily: there are almost no free charges

Is there any way to convert an insulator into a conductor?

Resistance: The resistance of a conductor to the flow of electricity.

(indicated by the letter "R")

Unit: ohm (abbreviated as ohm, symbol: Ω)

Units larger than ohms include: kilohms and megaohms

Conversion relationship: 1 megohm = 103 kilohm = 106 ohm

1. The wires connecting the circuit are copper wires plus plastic covers. Copper wires are conductors and plastics are insulators.

2. The reason why conductors conduct electricity easily is (C)

A. Because conductors are solid

B. Because the conductor contains charges

C. Because conductors contain charges that can move freely

D. Because the conductor is electrified

3. The resistance of a conductor to current is called the resistance of the conductor.

4. The resistance of a section of metal wire is

20000Ω=_____kΩ=_____MΩ

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"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 6:

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"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 3:

"Conductive Properties of Different Materials" Simple Circuit PPT Courseware 3 Experimental Exploration 1 Conductive Properties of Different Materials Given iron wire, plastic, copper wire, carbon rods, rubber, dry wooden sticks and other items, which materials are easy to conduct electricity? Which substances do not conduct electricity easily? How do you identify...

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Update Time: 2024-10-04

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

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