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"Series and Parallel Connection" Current and Circuit PPT Courseware 2
Think about it, do it
Using a power supply, two light bulbs, a switch and some wires to form a circuit, how many connections can be made to make both small light bulbs shine?
1. Series and parallel connection
1. A circuit in which electrical appliances are connected in sequence is called a series circuit.
2. Characteristics of series circuits:
①There is only one current path;
②Each electrical appliance affects each other;
③The switch controls all electrical appliances regardless of position.
3. A circuit in which electrical appliances are connected in parallel is called a parallel circuit.
4. Characteristics of parallel circuits:
①There are two (or more) current paths;
②Each electrical appliance works independently without affecting each other;
③The switch of the main circuit controls the entire main circuit, and the switch of the branch circuit only controls the branch circuit.
Want to discuss (P43)
Figure 15.3-6 is a simplified circuit diagram of a toy police car. After learning about series circuits and parallel circuits, can you understand this circuit diagram? Are the small light bulb L and the small motor M in the circuit diagram connected in series or in parallel?
Answer: It is connected in parallel. Because there are two current paths, and the motor M and the light bulb L do not affect each other, they can work independently.
Learn physics with hands and brain
1. As shown in Figure 15.3-6, two switches are used to control two light bulbs respectively. How should they be connected? Please draw the wiring in the diagram.
2. According to the circuit diagram in Figure 15.3-7A, use strokes to represent wires, connect the physical objects shown in 15.3-7B, and use arrows to mark the current directions of the main circuit and the two branch circuits in the circuit diagram when the switch is closed. .
3. Please draw their circuit diagrams based on the two physical circuits shown in Figure 15.3-8.
4. As shown in Figure 15.3-9, the school has a push button switch installed at the front and back doors. The school communication room has two lights A and B and battery packs. Requirements: When someone comes from the front door and presses the switch, light A lights up. When someone comes from the back door and presses the switch, light B lights up. Please design the circuit diagram and connect the wires in the physical diagram.
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