"Connecting Series Circuits and Parallel Circuits" Understanding Circuits PPT Courseware

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"Connecting Series Circuits and Parallel Circuits" Understanding Circuits PPT Courseware

series and parallel

1. The two most common connection methods of circuits: _______ and _______.

2. Series circuit

(1) Definition: A circuit in which circuit components _______ are connected in series is called a series circuit.

(2) Characteristics: ① There are only _______ paths for current, and there are no trunk paths or branches; ② The current passing through one electrical appliance must pass through another electrical appliance, and each electrical appliance _______ each other; ③ As long as the series circuit is connected in series Insert a switch to control _______.

(3) The circuit is as shown in the figure.

3. Parallel circuit

(1) Definition: A circuit that connects circuit components _______ is called a parallel circuit.

(2) Characteristics: ① The current has a __________ path, which is divided into a trunk path and a branch path; ② The trunk current is divided into two or more branches at the branch, and a part of the current flows in each branch. That is, each branch circuit forms a path with the power supply, and each branch circuit uses electrical appliances _______;

③The main circuit switch controls _______, and the branch circuit switch controls _______.

(3) The circuit is as shown in the figure.

4.Circuit connection

(1) Draw the circuit diagram, confirm that the circuit diagram is correct, and then connect the circuit according to the circuit diagram.

(2) Connect the circuit according to _______.

(3) During the wiring process, the switch must be _______. After checking that the circuit connection is correct, _______ the switch.

Identification of series and parallel circuits

To identify circuits, we must grasp the basic characteristics of series circuits and parallel circuits. Several commonly used methods include:

(1) Definition method: According to the definitions of series connection and parallel connection, judge by observing the connection mode of electrical appliances in the circuit. Electrical appliances connected one after another are connected in series; appliances connected in parallel are connected in parallel. The definition method is often used when judging the connections of physical circuits.

(2) Current method: Starting from the positive pole of the power supply, follow the path of the current to the negative pole of the power supply. There is no divergence along the way. It is always a path, which is a series connection; the current branches at one place and then merges at another place. It's a parallel connection. The current method is the most commonly used method to identify series and parallel circuits. It is mainly distinguished based on the path of the current and how many current paths there are in the circuit.

(3) Open circuit method: judge by observing whether the electrical appliances in the circuit interact with each other. Assume that one of the electrical appliances is disconnected and see if the other electrical appliance can still work. If it can still work, it is connected in parallel, otherwise, it is connected in series. The open circuit method is an important method for identifying difficult circuits.

(4) Node method: No matter how long the wire is, as long as there is no power supply, electrical appliance, etc., both ends of the wire can be regarded as the same point, thereby finding the common point at both ends of each electrical appliance. The node method is mainly used in the process of identifying irregular circuits and has very good results.

Knowledge point 1: Identification of series and parallel circuits

1. Regarding the connection of street lights on the road, which of the following statements is correct ()

A. It must be connected in series, otherwise it will not light up and turn off at the same time.

B. It must be connected in parallel, otherwise if one light is broken, the other lights will not light up.

C. Use a main switch to control these lights, either in series or in parallel.

D. Can’t see the wires and can’t judge

2. In the circuit as shown in the figure, the series circuit is ()

3. On January 1, 2013, the second and fifth classes of a middle school were holding a New Year's Day party. The lights in the classroom were shining and the singing was melodious. The connection method of the six lights in the classroom is ()

A. They are all connected in series

B. They are all connected in parallel

C. Connect two pairs in series and then in parallel

D. Connect two pairs in parallel and then in series.

4. During the English listening test, the wired speakers in each examination room are started and stopped at the same time. They are connected in a ________ connection because they ________ (optional "can" or "cannot") work independently.

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"Connecting Series Circuits and Parallel Circuits" Understanding Circuits PPT Courseware 3:

"Connecting Series Circuits and Parallel Circuits" Understanding Circuits PPT Courseware 3 Review A power supply, a light bulb, a switch, and several wires are connected to the circuit to make the small light bulb glow. 1. Draw a circuit diagram and mark the direction of current flow. 2. Connect the physical circuit. In the recent call...

"Connecting Series Circuits and Parallel Circuits" Understanding Circuits PPT Courseware 2:

"Connecting Series Circuits and Parallel Circuits" Understanding Circuits PPT Courseware 2 Review What did we learn in the previous lesson? 1. Several common circuit components 2. Symbols of several common circuit components Introducing a new lesson In the _________ studied in the previous lesson, we only used one...

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Update Time: 2024-11-22

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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