"Two Charges" Current and Circuit PPT Download

Description

"Two Charges" Current and Circuit PPT Download

Part One: Tutoring from Famous Teachers

Difficult points

1. There are only two types of charges in nature, positive charges and negative charges. Like charges repel each other, and dissimilar charges attract each other.

2. Atoms are composed of a nucleus and electrons outside the nucleus.

3. Objects that easily conduct electricity are called conductors, and objects that do not easily conduct electricity are called insulators.

Analysis of typical cases

[Example] A glass rod rubbed with silk is positively charged because ()

A. Electrons from silk transferred to glass rod

B． Positive charge on silk transferred to glass rod

C. Electrons from glass rod transferred to silk

D． Positive charge on glass rod transferred to silk

Error-prone warning

[Example] There are three lightweight balls A, B, and C. It is known that A is negatively charged, A and B attract each other, and C and A repel each other, then ()

A. B must be uncharged, C must be positively charged

B． B may be positively charged, and C may be positively charged.

C. B must be positively charged and C must be negatively charged

D． B may be uncharged and C may be negatively charged

Two kinds of charges PPT, part 2: basic training

two kinds of charge

As shown in the picture, a balloon that has been rubbed against hair is brought close to an empty can, and it is found that the empty can rolls to the side of the balloon. This is because the balloon _______, which will _______ the small can.

_______ is commonly used in laboratories to test whether objects are charged. It works based on the principle of _______.

Variation training

1. As shown in the picture, classmate Xiao Du touched the metal ball of the electroscope with a glass rod rubbed with silk, and saw that the metal foil of the electroscope opened. During this process ( )

A. Both the glass rod and the electroscope are negatively charged

B． The glass rod has a positive charge and the electroscope has a negative charge.

C. A glass rod rubbed with silk creates an electric charge

D． Metal foils open because like charges repel each other

Atoms and their structures

In the process of exploring tiny particles, people first discovered electrons and then realized that atoms are composed of _______ and _______ (as shown in the figure). Normally, the number of positive and negative charges carried in an object is _______ and does not appear electrical to the outside world.

Variation training

2. In the process of exploring microscopic particles, scientists realized that atoms are composed of electrons and nuclei, and the nuclei are composed of protons and neutrons. Which of the following particles is negatively charged ( )

A. Proton B. electronic

C. Neutron D. Nucleus

conductors and insulators

As shown in the figure, among the four materials that make up a pencil, usually _______ are conductors and _______ are insulators.

Variation training

3. Among the items shown in the picture, the ones that are usually conductors are ( )

Two kinds of charge PPT, the third part: Consolidation and improvement

1. As shown in the picture, on a sunny winter day, comb dry hair with a plastic comb. The more you comb your hair, the fluffier it becomes. The main reason is ()

A. When combing your hair, air enters your hair

B． When you comb your hair, the hair follicles shrink

C. The powerful effect of comb on hair

D. After the hair and comb are rubbed, the hairs with the same electric charge repel each other.

2. After tearing the plastic packaging bag into filaments, tie the upper end with a knot, and then use dry silk or fur to smooth down the filaments several times, hoping to make various situations as shown in the picture. Among them, the one that cannot be completed is ()

3. Which of the following knowledge about electricity is incorrect ( )

A. There are only two kinds of charges in nature, positive charge and negative charge

B． The electron is negatively charged, and the amount of charge it carries is 1.6×10-19C

C. Objects that can conduct electricity are called conductors, and objects that cannot conduct electricity are called insulators.

D. A helium atom has 2 positive charges in its nucleus and 2 electrons outside its nucleus

Keywords: Free download of PPT courseware for ninth-grade physics from People's Education Edition, PPT download of two types of charges, PPT download of current and circuit, .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 Teaching Courseware:

"Two Charges" Current and Circuit PPT Teaching Courseware Part One Content: Knowledge Management 1. Frictional electrification Definition: Using friction to charge an object is called triboelectrical electrification. Explanation: Electrically charged objects can attract _________. Essence: Bundles of atomic nuclei of different substances..

"Two Charges" Current and Circuit PPT:

"Two Kinds of Charges" Current and Circuit PPT Part One Content: A Classification Practice of Knowledge Points Knowledge Point 1 Two Kinds of Charges 1. The use of friction to charge an object is called ________. Put the balloon that has been rubbed against the woolen sweater close to your hair, and you will see what is shown in Figure 15-1-1.

"Exploring the Laws of Current in Series and Parallel Circuits" Current and Circuit PPT Courseware 2:

"Exploring the Laws of Current in Series and Parallel Circuits" Current and Circuit PPT Courseware 2 Experience: Current Characteristics of Series and Parallel Circuits Experiment Preparation: Power supply, switch, wires, and two small light bulbs with different specifications. Activity 1: Connect two small light bulbs to form a series circuit (as shown in the picture)..

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Update Time: 2024-11-21

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

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