"Current and Circuit" PPT courseware 7

Description

"Current and Circuit" PPT courseware 7

Classroom knowledge test:

1. Properties of charged objects:

2. Provisions for two types of charges:

3. Laws of interaction between charges:

4. Principle of electroscope:

5. The reason why most objects do not show electrical properties to the outside world is_______.

6. The essence of frictional electrification is ______________

7. Objects with strong controllability during friction will be ___ charged and become ____ charged.

6. Element charge refers to _________, e=____________

7. The applications of static electricity in life include ___, __, ___, ___

Knowledge links:

1. There are several kinds of electric charges in nature.

2. We live in a world of electricity. Based on life examples, can you tell us what electrical appliances are around us?

Three situations in which electric current is formed

Some rely on the directional movement of positive charges,

Some move in a direction based on negative charges.

Some rely on positive and negative charges to move in opposite directions at the same time.

People define the direction of directional movement of positive charges as the direction of current

According to this regulation, the direction of directional movement of negative charges is the same as the direction of current _______

Targeted exercises

1. Judgment:

As long as the charge moves, an electric current can be formed ( )

2. Judgment:

There is no current in a conductor, and the charge in the conductor is stationary ( )

3. Fill in the blanks:

If free electrons move from point A to point B in a metal conductor, then the direction of the current is ( )

Three states of the circuit

1. Path: After the circuit is connected, the circuit that is connected everywhere is called a path.

2. Open circuit: When the switch is not closed, or the wire is broken, causing the circuit to be disconnected somewhere, it is called an open circuit. Also called circuit break.

3. Short circuit: directly connect the two ends of the power supply or electrical appliance with a wire.

Expand and extend

Let’s discuss this as a group:

If you want the light bulb to glow for a long time, that is, to have a continuous current in the circuit, what do you think should be done?

Requirements for drawing circuit diagrams

1. The components should be evenly distributed.

2. Components cannot be placed at corners

3. The wires should be horizontal and vertical

4. The order of connections must be consistent

5. The circuit diagram should be drawn in a rectangular shape

Kind tips

1. Under no circumstances can the two ends of the battery be directly connected together with wires.

2. During the process of connecting the circuit, the switch must be turned off. After completion, check that there are no problems before closing the switch.

3. After the experiment, turn off the switch to save energy.

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Update Time: 2024-09-17

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 1 industry PPT template

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