| Category | Format | Size |
|---|---|---|
| Zhejiang Education Edition Eighth Grade Science Volume 1 | pptx | 6 MB |
"Charge and Current" PPT
Description
"Charge and Current" PPT
Part One Content: Life Introduction
Have you ever seen static electricity occur in your life?
Discharge static electricity when dressing in dry weather in winter
Tianganwu dry hands discharge static electricity when touching metal
Rub a plastic pen (or ruler) against your hair, and then move it closer to the scraps of paper. What do you see?
Phenomenon: The plastic pen (or ruler) attracts small paper scraps.
Why do glass rods and rubber rods become charged?
Number of protons = number of electrons outside the nucleus
Number of positive charges = number of negative charges
(No charge is present)
Under normal circumstances:
When the number of positively charged protons and negatively charged electrons is equal, the positive and negative charges can cancel each other out, and the entire object is not charged.
Charge and current PPT, part 2: frictional electrification
Essence: Triboelectricity does not create electric charge, but only transfers electric charge from one object to another.
1. Frictional electrification phenomenon
Friction between objects causes the electrons on one object to transfer to another object. The object that gains the electrons becomes negatively charged, and the other object that loses the electrons becomes positively charged by the same amount. This phenomenon is called triboelectricity.
My question: What is the cause of frictional electrification? Why do electrons transfer?
2. Causes of frictional electrification
Different substances have different abilities to bind electrons to atoms.
interaction between charges
Can two electrostatically charged objects interact? What are the rules for this effect?
Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, charge and current PPT download, .PPT format;
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"Charge and Current" PPT courseware:
"Charge and Current" PPT courseware Part 1: Do it and think about it Ask students to use a plastic pen or plastic comb to rub hard on their hair or clothes, and then move closer to the scraps of paper. Phenomenon seen: Rubbed plastic ruler attracts paper scraps. This is..
File Info
Update Time: 2024-07-06
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