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Authoritative PPT Summary
"Composition and Connection Methods of Circuits" Exploring Simple Circuit PPT Courseware 2
teaching objectives
1. Know the composition of a circuit, including paths, open circuits, and short circuits.
2. Be able to connect simple circuits and draw corresponding circuit diagrams.
3. Know that there are two ways of connecting circuits, be able to connect series and parallel circuits, and be able to draw and identify series and parallel circuit diagrams.
Check preview one
Know the composition of a circuit, know paths, open circuits, and short circuits
There are roads for pedestrians, roads for cars, and roads for the flow of electricity. If you want a small light bulb to light up, you must connect it to a circuit. Let's learn the simplest circuit below.
think:
You are given the following equipment: a dry battery, a small light bulb, a switch and 3 wires. Can you use these equipment to control the light bulb to turn on and off?
Conclusion: A circuit is an electrical path formed by connecting power supplies, electrical appliances, switches, etc. with wires.
Power supply: power supply
Electrical appliances: using electricity to work
Switch: Control circuit on and off
Wires: used to connect power supplies, electrical appliances and switches
Circuit: A path of electricity (current) formed by connecting power supplies, electrical appliances, switches, etc. with wires.
1. Circuit status
1.Passage: connected circuit
2. Open circuit: disconnected circuit
3. Short circuit: directly connect the two poles of the power supply with a wire
Experimental demonstration:
Characteristics of local short circuit:
When the circuit is connected, the current does not pass through the electrical appliance but flows to other electrical appliances through the wire, causing the electrical appliance to be short-circuited and unable to work, while other electrical appliances can still work.
Think about it:
What are the causes of open circuit failures?
The connected wires are broken, the switch is not closed, the internal parts of the appliance are damaged, and the connectors are loose (poor contact)
What are the causes of short circuit faults?
The two poles of the power supply are directly connected by wires, and the two ends of an electrical appliance are directly connected by wires.
Things to note when drawing circuit diagrams:
1. Completely and accurately reflect the composition of the circuit.
2. Use uniformly specified device symbols.
3. The circuit diagram should be concise and neat. Usually horizontal and vertical line segments are used to represent connecting wires. The corners are generally at right angles, and the entire circuit is rectangular.
4. Arrange the device symbols in reasonable positions and evenly distribute them. Do not draw the devices in the corners of the diagram. The circuit diagram should be clear and beautiful.
Characteristics of series circuits
1) There is only one path for current, and the current passing through one component also passes through another component.
2) Only one switch is needed in the circuit, and the position of the switch has no effect on the circuit.
Characteristics of parallel circuits
1) Electric current has two (or more) paths.
2) Each component can work independently.
3) The switch of the main circuit controls the entire main circuit, and the switch of the branch circuit only controls the branch circuit.
Homework and preview
Homework: After class 2.3.4
Preview: Regulation of current direction, units. Understand ammeter and instructions for use.
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"The Composition and Connection Method of Circuits" explores simple circuit PPT courseware 3:
"Composition and Connection Methods of Circuits" Exploring Simple Circuit PPT Courseware 3 (a) Power transmission circuit (b) Printed circuit (c) Household circuit Activity 1 How to make a small light bulb glow? Circuit A circuit is composed of ______, ______, ______, ______. Power supply: able to sustain...
"Composition and Connection Methods of Circuits" explores simple circuit PPT courseware:
"Composition and Connection Methods of Circuits" explores simple circuit PPT courseware Learning Objectives 1. Know the composition of a circuit, know paths, open circuits and short circuits, be able to connect simple circuits, and draw circuit diagrams. 2. Know the two ways of connecting circuits and be able to connect simple string...