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"Current and Circuit" PPT courseware
review test
1. What are the types and interactions of charges in nature?
2. Give an example of the phenomenon of frictional electrification and how the charge moves during this process?
3. Why does metal conduct electricity easily?
4. Give examples of what are conductors and insulators?
Imagine: What would our lives be like without electricity?
Think about it, do it
Experiment 1: How to make a small light bulb continue to glow?
Tip: Do not connect the two ends of the battery directly together with wires.
1. Current
Experiment 1: How to make a small light bulb continue to glow?
1. The formation of electric current: the directional movement of electric charges forms electric current
When the switch is closed, the small bulb continues to glow, indicating that charge continues to flow through the small bulb. The directional movement of charges creates an electric current.
2. Direction of current: The direction in which positive charges move directionally is defined as the direction of current.
(1) The directional movement of free electrons is opposite to the direction of current;
(2) Outside the power supply, the direction of current flows from the positive pole of the power supply to the negative pole.
2. Circuit
1. Circuit composition
The path through which current can flow composed of power supply, electrical appliances, wires, and switches is called a circuit.
2. The role of circuit components
(1) Power supply: Provide electrical energy
(2) Electrical appliances: consume electricity
(3) Wire: transmits electrical energy
(4) Switch: control circuit
Only when the circuit is closed can there be current in the circuit.
Requirements for drawing circuit diagrams
1. The components should be arranged appropriately and distributed evenly.
2. Don’t draw components at the corners.
3. The entire circuit diagram should be preferably rectangular with edges and corners, and the wires should be horizontal and vertical.
4. Develop a good habit of using letters to represent circuit components.
4. Circuit status
1. Path: A circuit that is connected everywhere and can work with electrical appliances.
2. Open circuit: A circuit that is disconnected somewhere and no current flows through it.
3. Short circuit: A circuit in which the positive and negative poles of the power supply are directly connected with wires.
practice
1. Please analyze the following circuit diagram, point out the wrong wires, and correct them.
2. Please analyze the following circuit diagram, point out the wrong wires, and correct them.
3. Please use a paintbrush instead of wires to connect the corresponding circuit according to the circuit diagram of the electric bell.
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