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Authoritative PPT Summary
"Conductivity and Resistance of Matter" PPT
Part One Content: Classroom Experiment
Give it a try: How to test the conductivity of a substance
Metal sheets, plastic rulers, glass rods, pencil leads (carbon rods), chalk, coins and other substances.
Which objects do you think conduct electricity easily? Which substances do not conduct electricity easily? How did you know? What method can be used to identify it on the spot?
in conclusion
Metal sheets, plastic rulers, glass rods, pencil leads (carbon rods), salt water, chalk, coins, toothpicks, cardboard, rubber, cotton thread, cooking oil, dry air and other substances, these substances with red letters are easy to conduct electricity , other substances do not conduct electricity easily.
Conductivity and resistance of matter PPT, Part 2 content: Introduction to life
Common conductors are: metal, graphite, human body, earth and salt water.
Common insulators are: rubber, glass, porcelain, plastic, dry wood, oil and dry air.
do you know?
All wires in household circuits are wrapped with insulating materials such as plastic and rubber. What is the main purpose?
Conductivity and resistance of matter PPT, Part 3: Self-description of semiconductors
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.
Please answer:
Why do conductors conduct electricity easily?
There is a lot of free charge
Why do metals conduct electricity easily?
There are a lot of free electrons
Why don't insulators conduct electricity easily?
Charges can hardly move freely
Conductivity and resistance of matter PPT, Part 4 content: Review questions:
What is the difference between conductors and insulators?
What does this indicate about the factors that affect the size of the resistor?
The resistance of a conductor is related to the material composition.
According to research, the resistance of metal conductors is also related to temperature.
As the temperature rises, the resistance of metal conductors increases.
As the temperature decreases, the resistance of metal conductors decreases.
Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, conductivity and resistance of matter PPT download, .PPT format;
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"Conductivity and Resistance of Matter" PPT download:
"Conductivity and Resistance of Matter" PPT Download Part One: Life Examples Which objects in life easily conduct electricity? Which ones don’t conduct electricity easily? Coins, plastic rulers, glass pieces, pencil lead, salt water, chalk, purified water. How to design an experiment? 1. Judgment criteria..
"Conductivity and Resistance of Matter" PPT courseware:
The first part of the PPT courseware "Conductivity and Resistance of Matter": Exploration and Application I will explore. Please put iron nails, plastic rulers, glass, pencil lead (carbon rod), salt water, matches, mineral water, etc. or choose one yourself Items of interest, connected to the circuit, detected...