"Two Charges" Current and Circuit PPT

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"Two Charges" Current and Circuit PPT

Part One Content: A Classification Practice of Knowledge Key Points

Knowledge point 1 Two kinds of charges

1. The use of friction to charge an object is called ________. If you bring the balloon that has been rubbed against the woolen sweater close to your hair, you will see a surprising phenomenon as shown in Figure 15-1-1. This is because the friction between the balloon and the woolen sweater will ___________ the uncharged hair.

2. There are two types of charges in nature: __________ and __________; the charge on a glass rod rubbed with silk is called __________; the charge on a rubber rod rubbed with fur is called __________. Like charges ________ each other, and dissimilar charges ________ each other.

3. The function of an electroscope is to test whether an object _________, and it is made based on the principle of __________________.

4. The amount of charge is called ________, its unit is ________, abbreviated as ________, and its symbol is ________.

5. As shown in Figure 15-1-2, A, B, and C are all lightweight balls suspended by thin wires. A is positively charged, B is negatively charged, and C is uncharged. The picture that can correctly reflect the situation when the ball is at rest is ()

Knowledge point 2 Atoms and their structures

6. Atoms are composed of a nucleus located in the center and _________ moving around the nucleus at high speed outside the nucleus. The nucleus is composed of _________ and _________, of which electrons are _________ charged, protons are _________ charged, and neutrons ________( Choose "With" or "Without").

7. Among the following statements about frictional electrification, which one is correct ()

A. Electrons are transferred from one object to another

B． Both objects have lost electrons to varying degrees

C. Two objects rubbing against each other create an electric charge

D. The nuclei of the two objects were transferred

8. When you comb your hair with a plastic comb, it will generate electricity due to friction. After testing, it is found that the charge carried by the plastic comb is negative charge. When you comb your hair ()

A. hair gets some electrons

B． Plastic comb loses some electrons

C. Plastic comb gets some electronics

D. There is no transfer of electrons between hair and comb

Two types of charges PPT, part 2: Comprehensive practice of the B-law method

12. As shown in Figure 15-1-3, a rubber rod rubbed with fur is brought close to a thin stream of water, and the thin stream of water bends. The principle of this phenomenon is different ()

A. The podium is covered with chalk dust

B． The rolling brush on the clothes sucks the dust into the brush

C. The blades of a long-used electric fan are covered with dust

D. Car bodies easily absorb dust

13. Electroscopes are often used in laboratories to test whether objects are charged. As shown in Figure 15-1-4, when a glass rod rubbed with silk is brought into contact with the metal ball of the electroscope, it can be found that the two metal foils of the electroscope will open due to repulsion. The correct understanding of this phenomenon is ()

A. The metal foil is positively charged and the metal ball is uncharged.

B． Both the metal foil and the metal ball are positively charged

C. The metal foil is positively charged and the metal ball is negatively charged

D. Both the metal foil and the metal ball are negatively charged

14. Figure 15-1-5 shows the interaction of four charged balls. It is known that ball A is negatively charged, then the situation of three balls B, C and D being charged is ()

A. Ball B has a negative charge and ball C has a positive charge.

D ball is positively charged

B． Ball B has a negative charge and ball C has a positive charge.

D ball is negatively charged

C. Ball B has a positive charge, ball C has a negative charge, and ball D has a positive charge.

D. Ball B has a positive charge, ball C has a negative charge, and ball D has a negative charge.

15． A rubber rod rubbed with fur is brought close to two small objects A and B. As a result, the rubber rod repels A and attracts B. Then it can be determined that ()

A. A is positively charged, B is negatively charged

B． A is negatively charged, B is positively charged

C. A is negatively charged, B is uncharged

D. A is negatively charged, and it cannot be determined whether B is charged or not.

16． There are two identical electroscopes A and B. A is positively charged and B is uncharged, as shown in Figure 15-1-6A. Use a copper rod with an insulated handle to connect the metal balls of the two electroscopes, as shown in Figure B. The moment of connection is ()

A. Positive charge moves from A to B

B． Electrons move from A to B

C. Positive charge moves from B to A

D. Electrons move from B to A

Two types of charges PPT, the third part: Practical practice of C high-frequency examination questions

18. [2017·Taizhou] Rub the sweater with a plastic rod. After the friction, the plastic rod can attract paper scraps, indicating that the charged object has the property of ______________; if the rubbed plastic rod is used to contact the metal ball of the electroscope ( As shown in Figure 15-1-8), the metal foil of the electroscope opens. This is because the metal foils carry ________ (optional "same" or "different") charges that repel each other. The essence of triboelectricity is the transfer of ________ between substances.

19. [2017·Zhuzhou]Frictional electrification does not create electric charges, but only transfers electric charges from one object to another, separating positive and negative charges. A rubber rod rubbed with fur becomes negatively charged because ()

A. Electrons transferred from fur to rubber rod

B． Electrons were transferred from the rubber rod to the fur

C. Protons transferred from fur to rubber rod

D. Protons are transferred from the rubber rod to the fur

20. [2017·Hohhot] Regarding conductors and insulators, which of the following statements is correct ()

A. Insulators have a greater resistance to current flow, but they can be charged

B． Metals can conduct electricity because the electrons in the metal can move freely

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

D. Insulators cannot conduct electricity because there are no electrons in the insulator

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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 Download:

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Update Time: 2024-09-30

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