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"Composition and Connection Methods of Circuits" Exploring Simple Circuit PPT Courseware 3
(a)Transmission circuit
(b)Printed circuit
(c)Home circuit
Activity 1
How to make a small light bulb glow?
circuit
The circuit is composed of ______, ______, ______, ______.
Power supply: A device that can continuously provide electrical energy to electrical appliances.
Electrical appliance: A device that uses electrical energy to work.
Switch: controls the work of electrical appliances.
Wires: Connect the above devices.
path, open circuit, short circuit
a. Path: After the circuit is connected, the circuit that is connected everywhere is called a path.
b. 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.
c. Short circuit: Connect both ends of the power supply directly with wires. This is not allowed because it will burn out the power supply and wires, possibly causing a fire.
When drawing a circuit diagram, you should do the following:
1. The components should be arranged appropriately and distributed evenly;
2. The entire circuit diagram is best in a rectangular shape, and the wires should be horizontal and vertical.
3. Don’t draw components at the corners.
4. Draw in order from the positive pole to the negative pole.
Drawing circuit diagrams must be standardized
(1) Use unified symbols to express.
(2) When connecting, draw the lines horizontally and vertically.
(3) The lines should be drawn concisely, neatly and beautifully.
Do it yourself: Draw a circuit diagram of the circuit you just connected.
series connection
Series circuit: A circuit in which circuit elements are connected one after another, and there is only one path for current to flow.
series circuit
Series circuit characteristics:
1. There is only one path for current
2. A certain part of the circuit is disconnected and the entire circuit is open.
3. The control effect will not be affected if the switch is connected at any position.
4. Each electrical appliance affects each other
in parallel
Parallel circuit: A circuit in which electrical appliances are connected in parallel, with multiple current paths (including main circuits and branch circuits)
parallel circuit
Characteristics of parallel circuits:
1. The current has two or more paths
2. The dry circuit switch can control all electrical appliances in the circuit
3. Branch circuit switches only control the electrical appliances in their respective branches.
4. Each branch works independently without affecting each other.
Consolidation exercises
1. If there are two electrical appliances in the circuit, which of the following statements is correct ( )
A. After closing the switch S, the lights that light up at the same time must be connected in series.
B. After closing switch S, the lights that light up at the same time must be connected in parallel.
C. After closing the switch S, the lights that light up at the same time may be in parallel or in series.
D. Insufficient conditions make it impossible to determine.
2. Find the errors and deficiencies in the circuit connection diagram below.
A: The circuit is short-circuited. Although there are electrical appliances in the circuit, they are not connected to the circuit.
B: L2 in the circuit is not connected to the circuit, causing L2 to be partially open.
C: Although the circuit is connected correctly, it is easy to cause confusion due to crossed wires.
Analysis of typical cases
1. If there are two electrical appliances in the circuit, which of the following statements is correct ( )
A. After closing switch S, the two lights that light up at the same time must be connected in series.
B. After closing switch S, the two lights that light up at the same time must be connected in parallel.
C. After closing the switch S, the two lights that light up at the same time may be connected in parallel or in series.
D. Insufficient conditions to determine
2. Which of the following statements about series circuits is incorrect ( )
A. The switch can make each light bulb in the circuit light up or go out at the same time.
B. If an electrical appliance has an internal open circuit, the other electrical appliances may still be powered on.
C. If one electrical appliance is short-circuited, the other electrical appliances can still work.
D. When connecting the circuit, the switch can be connected from the positive or negative pole of the power supply, or the switch can be connected between the electrical appliances.
3. Which of the following statements about parallel circuits is incorrect ( )
A. All electrical appliances are connected in parallel
B. If one electrical appliance has an open circuit, the other electrical appliances can still be powered on.
C. A parallel circuit is composed of a main circuit and a branch circuit.
D. If a certain electrical appliance is short-circuited, the other electrical appliances can still be powered on.
High School Entrance Examination Link
1. Most cars are equipped with an indicator light to remind the driver whether the door is closed. As long as one of the four doors is not closed (equivalent to a switch being turned off), the indicator light will illuminate. The picture below shows the analog circuit diagram designed by several students. Which one do you think best meets the above requirements ( )
2. In the corridors of residential buildings, people only occasionally pass by at night, and the lights are always on, which wastes electricity. Xiao Ming wants to use light-controlled switches and voice-controlled switches to design a "smart" circuit - at night, when someone moves around and makes a sound, the lights turn on; during the day, no matter how loud the sound is, the lights will not turn on. Please connect the equipment in the picture on the right into a circuit that meets the requirements (the light-controlled switch automatically closes when it gets dark and opens automatically when it gets light; the sound-activated switch turns off the station when someone moves around and makes a sound, and it automatically turns off after one or two minutes after it is closed) disconnect).
Choose to do
1. As shown in the picture, use strokes as wires according to the circuit diagram to connect the components.
Method: First connect a more complex series circuit, then find the branch points, and finally connect other branches to the circuit.
2. As shown in the circuit in the figure, if you want the light bulbs L1 and L2 to form a series circuit, you should close _____ and open _____; if you want the light bulbs L1 and L2 to form a parallel circuit, you should close _____ and open _____.
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"The Composition and Connection Method of Circuits" explores simple circuit PPT courseware 2:
"The Composition and Connection Method of Circuits" Exploring Simple Circuit PPT Courseware 2 Teaching Objectives 1. Know the composition of circuits, know 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 to connect a circuit and be able to connect strings...
"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...