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"What is Electricity" Understanding Circuits PPT Courseware 2
teaching objectives
1. Know about frictional electrification and be able to explain related phenomena.
2. Understand the laws of charges and their interactions.
3. Know the structure and principle of the electroscope, and be able to use the electroscope to determine whether an object is charged.
Focus: The definition of two kinds of charges and the interaction between charges.
1. Electricity and life
Electric lights make city nights colorful
How many appliances are there in the kitchen of a modern family?
2. Two kinds of charges
1. Explore the phenomenon of frictional electrification
(1) A rubbed plastic comb can ______ light small objects.
(2) Place the rubbed plastic rod close to the thin stream of tap water, and the stream will bend.
in conclusion
1. Some objects can attract light and small objects after being rubbed. People call this phenomenon that the objects are charged, or "charged".
2. Using friction to charge objects is called frictional electrification. A charged object can attract light and small objects.
2. Explore the types and interaction rules of charges
(1) When two glass rods rubbed with silk come close to each other, they _____ each other.
(2) When two rubber rods rubbed with fur come close to each other, they _____ each other.
(3) When a glass rod rubbed with silk and a rubber rod rubbed with fur come close to each other, they will _____ each other.
Class exercises
1. Rub two fully inflated balloons on your hands or clothes for a few times, and then lift up the hanging thread. We can see that the two balloons _____ each other. The reason is _______.
2. Use a rubber rod that has been rubbed with fur to touch the metal ball of the charged electroscope. If you find that the metal foil of the electroscope first closes and then opens, then. ( )
A. The electroscope was originally negatively charged, but later became positively charged
B． The electroscope was initially positively charged, but later became negatively charged
C. The electroscope has a positive charge one after another
D． The electroscopes are all negatively charged one after another
3. Which of the following phenomena does not belong to frictional electrification ( )
A. A slight popping sound is heard when taking off a sweater in dry weather
B． When you comb your hair with a clean plastic comb, the hair will float with the comb.
C. Chemical fiber clothes especially attract dust when worn on the body
D． Chalk dust falls everywhere when wiping the blackboard
Summary of this lesson
1. Life and electricity
2. Two kinds of charges
3. The interaction rules of charges
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