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"Understanding Circuits" Simple Circuit PPT Courseware
simple circuit connections
Modern life without electricity would be unimaginable. Occasionally, if there is a power outage, modern cities will be unable to move forward.
Observe and think
Circuit: Use wires to connect power supplies, electrical appliances, and switches to form a path for current.
1. Composition of the circuit
A circuit is a path that connects power supplies, switches, and electrical appliances with wires to form a current path.
think
What symbol is the positive terminal of a power supply usually marked with? What symbol is the negative terminal usually marked with?
common switches
Think: What state should the switch be in when connected to the circuit?
2. Access, open circuit and short circuit
1. Path: a circuit that is connected everywhere.
2. Open circuit: disconnected circuit.
3. Short circuit: A circuit in which the two poles of the power supply are directly connected with wires without using electrical appliances.
3. Circuit diagram
Use prescribed symbols to represent components in a circuit, and connect these symbols with line segments representing wires to represent a circuit composed of physical objects. This kind of diagram is called a circuit diagram.
Notice
(1) Use uniformly prescribed symbols;
(2) Try to avoid crossing;
(3) Connect the wires horizontally and vertically, and try to keep the circuit diagram simple and beautiful;
(4) The component layout is reasonable;
(5) Power supply, switches and electrical appliances cannot be connected at corners;
(6) The positions of components in the circuit diagram should correspond to the physical diagram.
Exercise: How are the flashlight batteries, bulbs, and switches connected? Generally, the shell of a flashlight is made of metal. What role does it play? How to connect the battery and bulb to a plastic-cased flashlight? Try to draw the circuit diagram of the flashlight in the picture.
answer:
① The metal shell acts as a conductor.
② The plastic-cased flashlight uses wires to connect the battery and bulb.
On-site inspection:
1. Connect ________, ________, and ________ with ________ to form a circuit. Only when the circuit ________, can there be current in the circuit.
2. The power supply in the circuit is a device for ________ electric energy, the electrical appliance is a device for ________, the wire is for ________ electric energy, and the switch is for __________.
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"Understanding Circuits" Simple Circuit PPT Courseware 6:
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"Understanding Circuits" Simple Circuit PPT Courseware 5:
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"Understanding Circuits" Simple Circuit PPT Courseware 4:
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