"Series and Parallel Connection" Current and Circuit PPT Courseware 3

Description

"Series and Parallel Connection" Current and Circuit PPT Courseware 3

learning target

1. Know the characteristics of series circuits and parallel circuit connections

2. Be able to connect simple series circuits and parallel circuits

3. Be able to draw simple series and parallel circuit diagrams

Self-study guidance

Please read the contents of textbook P41-43, understand what series and parallel circuits are based on Figures 15.3-1 and 2, understand the experimental content on page 42, and be able to summarize the characteristics of series and parallel circuits based on the demonstration experiment after 5 minutes.

1. Characteristics of series circuits:

Connect the two lights L1 and L2 to form the circuit as shown below.

1. Connection characteristics of series circuits: electrical appliances ______ (connection)

2. Close the switch: lamp L1______, lamp L2______; turn off the switch, lamp L1______, lamp L2______.

Features: The switch controls the ___ or ___ of two lights at the same time.

3. Close the switch, lights L1 and L2 are ______ at the same time, and remove one of the lights, the phenomenon that occurs is ______.

Explanation: There are only ______ paths in a series circuit, and the lights (electrical appliances) on the circuit turn on and off ______ each other.

circuits in life

Decorative lanterns

Light bulbs decorating tall buildings

Lights, TVs, etc. in the home

Fluorescent lamps in the classroom

Test questions

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 make it impossible to determine.

2. The circuit shown in the figure below is called a ______ circuit. In the figure, switch S1 is used to control ______, switch S2 is used to control ______, and switch S is connected to the ______ circuit, it can control ______ at the same time. Use a pencil to mark the direction of current in the circuit in the diagram (after all switches are closed).

Series and parallel circuit exercises

How to identify series and parallel circuits

①Definition method: Directly determine the connection method of the circuit based on the definitions of series and parallel.

②Current method: Determine the connection method of the circuit based on the direction of current flow. When the current passes through each component on the circuit and there is no shunting phenomenon, it is a series connection; if there is a shunting phenomenon, the branches of the shunting are connected in parallel.

③Circuit breaking method: If one element in the circuit is removed and an open circuit occurs, the circuit is connected in series; if one element in the circuit is removed, and the others still work normally, the circuit is connected in parallel.

④Node method: Any several points connected by wires can be regarded as the same point (i.e. node). If there is only one path connected between two nodes, it is a series connection, otherwise it is a parallel connection.

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Update Time: 2024-07-30

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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