"Two Charges" Current and Circuit PPT Courseware 5

Description

"Two Charges" Current and Circuit PPT Courseware 5

Atomic structure elemental charge

1. Structure of atoms:

2. People call the minimum charge (amount) the element charge, which is commonly represented by the symbol e.

e=1.6×10 -19C

The charge of any charged object is an integer multiple of e.

Under normal circumstances, the positive charge carried by the nucleus is equal in quantity to the total negative charge carried by all electrons, and the entire atom is neutral, that is, the atom does not appear to be charged to the outside world.

Tell me your guess

A glass rod rubbed with silk has a _____ charge. Did you know that silk has a _____ charge? A rubber rod rubbed with fur has a _____ charge. Did you know that fur has a _____ charge?

Why can objects be charged through friction?

The essence of triboelectricity: transfer of electrons

Those with strong binding ability get electrons: negatively charged

Loss of electrons with weak binding ability: positively charged

Charged objects sometimes come into contact with other objects and lose electrons. So, what objects easily conduct charge? What object does not conduct electric charge easily?

conductor insulator

1. Conductor: An object that easily conducts electricity.

Such as: metal, human body, salt water solution, etc.

2. Insulator: An object that does not conduct electricity easily.

Such as: rubber, glass, plastic, ceramics, etc.

Metals conduct electricity through free electrons.

student discussion

1. Why is a glass rod rubbed with silk charged positively, and a rubber rod rubbed with fur charged negatively?

2. Comb your hair with a plastic comb a few times. Why does your hair become fluffy and "float" with the comb?

3. If we wear chemical fiber clothes, we sometimes find that the clothes stick to the skin. Why?

4. When you take off your sweater at night in winter, you may sometimes make noises or even sparks. Let’s briefly analyze the reasons.

Class exercises

1. The glass rod rubbed with silk is ______ charged, and the interaction between charges is ____________.

2. There are four charged objects ABCD. If A repels B, A attracts C, and C repels D. If D is negatively charged, then C is charged with ______, A is charged with ______, and B is charged It's ______ electricity.

3. Among rubber, human body, glass, ceramics, copper, and aluminum, the ones that are conductors are ______; those that are insulators are ______.

4. The working principle of the electroscope is ______ and its function is ______.

5. Normally, the _____ charge carried by the nucleus and the _____ charge carried by the electrons are ____ in number; so the atom is neutral.

6. Frictional electrification does not mean that the charge is ______, but that the charge is ______.

7. When silk and glass rod rub, electrons are transferred from _______ to _____. The glass rod is charged with _____ electrons (optional "lost" or "gained"); the silk is charged with _____ electrons. _____electricity.

Class feedback

1. Three small insulating balls can attract each other, then ( )

A. All three balls must be charged

B. Only two small balls are charged, and they have different charges.

C. Only one ball is charged

D. The above three situations are all possible

2. There are four small balls A, B, C, and D. If A and the glass rod rubbed with silk attract each other, B repels A, C attracts B, and D attracts C, then ball D ( )

A. Must not be charged B. Cannot be positively charged

C. Must be negatively charged D. Not charged or negatively charged

Keywords: Current and circuit teaching courseware, Two kinds of electric charge teaching courseware, New People's Education Edition ninth grade physics PPT courseware, Ninth grade physics slide courseware download, Current and circuit PPT courseware download, Two kinds of electric charge PPT courseware download, .ppt format

For more information about the PPT courseware "Current and Two Charges in Circuits", please click on the "Two Charges in Current and Circuit ppt ppt" tab.

"Two Charges" Current and Circuit PPT Courseware 4:

"Two kinds of charges" Current and circuit PPT courseware 4 1. Frictional electrification 1. If an object has the property of attracting light and small objects, we say that the object is charged or charged. 2. Frictional electrification: Using friction to electrify an object is called frictional electrification. 3. Electrical..

"Two Charges" Current and Circuit PPT Courseware 3:

"Two Charges" Current and Circuit PPT Courseware 3 Charge Objects that can attract light and small objects are called charged bodies, or charged objects. We just say that the body is charged, or charged. Properties of charged objects: Can attract light and small objects 1. Electricity generated by friction..

"Two Charges" Current and Circuit PPT Courseware 2:

"Two kinds of charges" Current and circuit PPT courseware 2 1. Two kinds of charges Experiment and observation Interaction between charges Any charged body that repels a glass rod rubbed with silk must be attracted to a rubber rod rubbed with fur. 1. There are only two types of electric charges in nature...

File Info

Update Time: 2024-07-28

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

Preview