"Two Charges" Current and Circuit PPT Courseware Download

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"Two Charges" Current and Circuit PPT Courseware Download

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Two kinds of charges

1. Use a plastic comb to comb dry hair a few times, and the plastic comb will be charged. This method of charging the comb is called frictional electrification. When you put the charged comb close to the thin stream of water released from the tap, you will observe that the water is being charged. attract.

2. (Qinghai High School Entrance Examination) When a glass rod rubbed with silk is used to approach a light ball, a situation as shown in the figure occurs. Then the charging condition of the ball is (A)

A. Positively charged B. Negatively charged

C. No charge D. Unable to determine

3. Contact the uncharged electroscope with the plastic rod that has been rubbed with the fur clothes, and the foil of the electroscope will open. Use "+" to indicate positive charge, and use "-" to indicate negative charge. The correct way to indicate the charge status of each part in the figure is (C)

Knowledge point 2 Atoms and their structures

4. The nucleus of metallic tin has 50 positive charges equal to the electron charge, and its atomic nucleus has 50 electrons. These electrons have a total charge of 8×10-18 C.

5. Atoms are composed of nuclei and electrons. It can be explained with the knowledge of atomic structure: frictional electrification is actually the transfer of electrons between objects. Object B that has rubbed against A is positively charged because object B lost (optional "gain" or "lost") electrons during the friction process.

Knowledge point 3 Conductors and insulators

6. We use 2B pencils to fill in machine-readable cards in many subjects during exams. The computer can directly read the answers on the machine-readable cards because the graphite in the 2B pencil is a conductor (optional "conductor" or "insulator" ).

7. Among the following items, which are usually insulators (A)

A. Glass rod, rubber rod B. Bamboo chopsticks, coins

C. Metal spoon, plastic ruler D. Ceramic bowl, salt water

Two types of charge PPT, part 2: improvement of comprehensive capabilities

8. (Zaozhuang High School Entrance Examination) There is an "static ball" in the science and technology museum. When a person touches the "static ball", the hair strands will stand up one by one, forming a "furious hair" scene, as shown in the picture. This is because The result of hair ribbons with the same type of charge (select "same type" or "different type") repelling each other.

9. The picture below shows the ranking of the atomic nuclei of different substances in terms of their ability to bind electrons. The friction between fur and the comb in the picture is the easiest to generate electricity, and after they rub, the fur will have a positive (optional "positive" or "negative") electric charge. .

10. (Chifeng High School Entrance Examination) As shown in the picture, use a rubber rod rubbed with fur to contact the metal ball of the electroscope. If you see the two metal foils of the electroscope open, it means that the rubber rod is charged. The friction between the rubber rod and the fur causes the charge to be transferred from one object to another.

11. When flying at high speed, the friction between the aircraft and the air will easily lead to charges. If the charge cannot be transferred in time during landing, it will easily endanger the lives of ground personnel. Therefore, aircraft tires are often made of conductor (optional "conductor" or "insulator") materials. , to avoid causing harm.

12. (Yiyang High School Entrance Examination) Two lightweight foam balls A and B are suspended with insulated thin wires. The interaction between them is as shown in the figure. Which of the following statements about the electrification of the two balls is correct (D)

A. Both balls are positively charged

B. Both balls are negatively charged

C. If A is positively charged, then B must be negatively charged

D. If A is negatively charged, then B may not be charged

13. (Anhui High School Entrance Examination) As shown in the figure, when the charged object contacts the metal ball of the electroscope, which of the following statements is correct (C)

A. If the charged object has a positive charge, all these positive charges will be transferred to the metal foil through the metal rod.

B. If the charged object has a negative charge, all these negative charges will be transferred to the metal foil through the metal rod.

C. If the charged object has a positive charge, some of the electrons of the electroscope will be transferred to the charged object.

D. If the charged object has a negative charge, part of the positive charge of the electroscope will be transferred to the charged object.

14. As shown in the picture, the little girl’s hair will float after rubbing the balloon on her hair. Which of the following statements is correct (B)

A. Balloons and hair attract each other because of the gravitational force between molecules.

B. The balloon and the hair have different charges and attract each other.

C. The balloon and the hair have the same charge and attract each other

D. Balloons attract hair but hair does not attract balloons

Two kinds of charges PPT, the third part: Expansion, exploration and breakthrough

18. There is an exhibit in the China Science and Technology Museum - an electrostatic rolling ball, as shown in the picture. It consists of a center electrode, metal balls, and a grounded metal plate. When the handle is turned, the metal ball will circulate and reciprocate between the center electrode and the grounded metal plate.

(1) Turn the handle so that the center electrode is positively charged, the side of the metal ball close to the center electrode is negatively charged, and the side away from the electrode is charged with an equal amount of different charges. The central electrode is attractive to negative charges and repulsive to positive charges; because the negative charges are closer to the central electrode, the attraction is greater than the repulsive force, and the metal ball will come closer (optional "closer" or "away") center electrode;

(2) When the metal ball collides with the center electrode, the negative charge is neutralized. At this time, the metal ball is positively charged. Since the same charges repel each other, the metal ball will move away from the center electrode; when the metal ball collides with the grounded When the metal plates collide, positive charges are introduced into the ground, and the ball returns to electrical neutrality.

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.

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Update Time: 2024-10-01

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