"Starting from Lightning" Exploring Simple Circuit PPT Courseware 2

Description

"Starting from Lightning" Exploring Simple Circuit PPT Courseware 2

teaching objectives

1. Know the phenomenon of frictional electrification.

2. Understand the rules of two kinds of charges and their interaction.

3. Lightning is a discharge phenomenon. Know the application and protection of static electricity.

Detection Preview 1

1. Know the phenomenon of friction starting point.

2. Understand the rules of two kinds of charges and their interaction.

1. What is electricity?

Activity 1 Observe the phenomenon of frictional electrification

Rub a plastic ruler (plastic-cased pen, plastic comb) over your hair or nylon clothing a few times, then hold it close to the small scraps of paper. What's happening?

Phenomenon: Attracting small confetti.

Summary and conclusion

Rubbed plastic rulers and plastic-cased pens can attract paper scraps and other light objects, and we say they are electrified or charged.

Frictional electrification: Using friction to charge objects.

Electrically charged objects are also called "____________"

2. Interaction between charges

Activity 2

Study the interaction between charges

Use the experiments shown in Figure 11-4(a)(b)(c) to study this problem.

What happened is written in the textbook.

Like charges repel each other,

Different charges attract each other.

Activity 3 (P44)

Using electricity to simulate lightning phenomena

Shake the motor handle and when the speed gradually increases, what do you see?

Phenomenon: Spark discharge occurs between the two balls.

Tip discharge: When an object is charged, its tip is prone to discharge.

1. Use a glass rod rubbed with silk to get close to the light ball. If the ball is attracted, the ball is ( )

A. Positively charged B. Negatively charged

C. Uncharged D. May be negatively charged or uncharged

2. Use silk thread to hang three grass balls. If any two of them are attracted to each other when they are close, they may be ( )

A. Two are positively charged and one is negatively charged.

B. Two are negatively charged and one is positively charged.

C. Two are positively charged and one is uncharged.

D. Two are charged with different types of electricity, and one is uncharged.

3. How to know if an object is charged?

Electroscope: An instrument used to test whether an object is charged.

The principle of the electroscope: use similar charges to repel each other.

The more electricity the charged object carries, the wider the angle at which the electroscope's metal foil opens.

4. Application and protection of electrical phenomena

Electrostatic spraying

Electrostatic flocking

Electrostatic precipitator

xerography

lightning rod

Homework and preview

Homework: After class 1.2.3.5

Preview: What are the components of a circuit? What are pass, short and open circuits? Master the circuit symbols of common electrical appliances and what to pay attention to when drawing circuit diagrams. What are series and parallel connections? What is a branch road?

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For more information about the PPT courseware "Exploring Simple Circuits Starting from Lightning", please click the "Exploring Simple Circuits ppt Starting from Lightning" tag.

"Starting from Lightning" Exploring Simple Circuit PPT Courseware 3:

"Starting from Lightning" Explore Simple Circuit PPT Courseware 3 How Lightning is Produced The movement of clouds will rub against the air, and the clouds will also rub against each other, which will generate and accumulate a large amount of charge. Lightning is the movement of electrical charges from a cloud to the ground or from one cloud to another..

"Starting from Lightning" explores simple circuit PPT courseware:

"Starting from Lightning" explores simple circuit PPT courseware Learning objectives 1. Understand the phenomenon of frictional electrification. 2. Know the rules of two kinds of charges and their interaction. 3. Know that lightning is an instantaneous large-scale discharge phenomenon. Core test points: Frictional electrification, electric charge..

File Info

Update Time: 2024-07-23

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 1 industry PPT template

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