"Charge" Simple Circuit PPT Courseware 7

Description

"Charge" Simple Circuit PPT Courseware 7

Project main content

Frictional electrification: A rubbed hard rubber rod or glass rod can attract light and small objects. We say that the hard rubber rod or glass rod is charged, or that it has ______. The phenomenon of making objects electrified by friction is called ______

Frictional electrification does not create charges, but transfers ______ from one object to another. The object that loses ______ is positively charged, and the object that gains ______ is negatively charged.

two kinds of charge

Positive charge The charge on ______ rubbed with silk is defined as positive charge.

Negative charge The charge on ______ that has been rubbed with fur is defined as negative charge.

How to check whether an object is charged

(1) Utilize the property of charged bodies to attract light and small objects.

Method: Bring the object close to a light and small object (such as small scraps of paper, etc.). If the two attract each other, it proves that the object is charged.

(2) Utilize the law of interaction between charges.

Method: Put the object close to the known charged body. If the object and the known charged body attract each other, it means that the object and the known charged body have opposite electrical properties or the object is not charged; if the object and the known charged body repel each other, it means that the object and the known charged body are mutually repulsive. It is known that the electrical properties of charged objects are the same.

(3) Use an electroscope.

Method: Touch the object to be measured to the metal ball of the electroscope. If the metal foil opens, it proves that the object to be measured is charged.

[Example] An electroscope is often used in the laboratory to test whether an object is charged. A glass rod rubbed with silk is used to contact the metal ball of the electroscope. It can be found that the two metal foils of the electroscope will open due to repulsion. For this The correct understanding of the 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

Analysis: The glass rod rubbed with silk is positively charged. When the glass rod is brought into contact with the metal ball of the electroscope, both the metal foil and the metal ball are positively charged. The two metal foils will repel each other and open because they have the same charge.

1. When a balloon that has been rubbed against a woolen sweater is brought close to the hair, the hair will be _________ uncharged due to the _________ caused by the friction of the balloon.

2. Bring the negatively charged object A close to the insulating ball hanging under the thin wire, and the ball will be repelled; if a positively charged object B is used to approach but not touch the ball, the ball ()

A.Stand still

B. Must be attracted to object B

C. Must be repelled by object B

D. It may be repelled by object B, or it may be attracted by object B

3. The metal foil of the electroscope opens, indicating that the electroscope ()

A. Not charged B. Positively charged

C. Negatively charged D. May be positively charged or negatively charged

Keywords: simple circuit teaching courseware, charge teaching courseware, Beijing Normal University edition ninth grade physics PPT courseware download, ninth grade physics slide courseware download, simple circuit PPT courseware download, charge PPT courseware download, .PPT format;

For more information about the "Simple Circuit Charge" PPT courseware, please click on the "Simple Circuit ppt Charge ppt" tab.

"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..

"Charge and Current" PPT:

"Charge and Current" PPT Part One: Introduction to Life Have you ever seen the occurrence of static electricity in your life? Static electricity is discharged when dressing in dry weather in winter. Static electricity is discharged by touching metal with dry hands. Rub a plastic pen (or ruler) with your hair, and then move it close to a small piece of paper.

"Charge Triboelectricity" Current and Circuit PPT Courseware 4:

"Charge Triboelectricity" Current and Circuit PPT Courseware 4 Static Electricity Phenomenon Observation and Experiment Triboelectricity Rub a plastic comb, plastic ruler or plastic penholder with the hair, and then bring it close to the scraps of paper to observe the phenomenon. Phenomenon: Rubbed combs and rulers can attract debris...

File Info

Update Time: 2024-11-18

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

Preview