"Assembling Circuits" Simple Circuit PPT Courseware 2

Description

"Assembling Circuits" Simple Circuit PPT Courseware 2

Practice

How to make two light bulbs light up at the same time

Think of several different connection methods and draw a circuit diagram

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.

1. Characteristics of series circuits:

Experiment: Connect two lamps L1 and L2 to form the circuit shown below.

⑴Close the switch: lamp L1_____, lamp L2_____; turn off the switch, lamp L1_____, lamp L2_____.

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

⑵Close the switch, lights L1 and L2 are _____ at the same time, and remove one of the lights, what happens is __________.

The reason is: there are only _____ paths in a series circuit, and the lights on the circuit turn on and off _____ each other.

Series connection

A circuit in which circuit elements are connected one by one

Features: There is only one current path in the circuit; if there is a problem somewhere in the circuit, it will affect the entire circuit.

The function of the switch: to control the entire circuit.

in parallel

Parallel circuit: A circuit in which electrical appliances are connected in parallel, with multiple current paths (including main circuits and branch circuits)

2. Characteristics of parallel circuits

Experiment: Connect two electric lamps L1 and L2 to form the circuit shown below.

⑴Close switches S1 and S2. Close the switch S, the lamp L1_____; the lamp L2_____, open the switch S, the lamp L1_____, the lamp L2_____.

Feature 1: The dry circuit switch controls the lights on _______.

⑵Close switch S. When the switch S1 is closed, the light L1_____ is turned off; when the switch S1 is turned off, the light L1_____. When the switch S2 is closed, the light L2_____ is turned off; when the switch S2 is turned off, the light L2_____ is turned on.

Feature 2: The branch switch controls the lights on _____.

⑶Close switches S, S1, S2, lights L1, L2 _____, remove one light, and the other light _____.

Feature 3: The lamps on each branch of the parallel circuit are affected by _______.

Parallel connection

A circuit in which electrical appliances are connected in parallel.

Main circuit: A circuit through which all current flows.

Branch: A circuit through which part of the current flows.

Features: There are multiple current paths in the circuit; each branch does not affect each other.

The function of the dry circuit switch is to control the entire circuit.

The function of the branch switch is to control the branch.

Classroom consolidation

1. There are three electric lamps. I want to connect them in a circuit. It is required that the use or non-use of each electric lamp does not affect the other lamps. They should be connected ( ). (Draw the circuit diagram)

2. If there are two electrical appliances in the circuit, after closing the switch, the two lights will light up at the same time. Which of the following statements is correct ( )

A. The two lights must be connected in series.

B. The two lights must be connected in parallel.

C. The two lights may be connected in series or in parallel.

D. The conditions are insufficient and it is impossible to judge.

knowledge application

Determine what connection method should be used for the following circuits (series or parallel)

(1) The lanterns hung in our house during the Chinese New Year. ( )

(2) Electric lights, televisions, and refrigerators at home. ( )

(3) At night, the lights on the road turn on and off. ( )

(4) Fluorescent lamps in the classroom. ( )

(5) Every machine in the factory workshop must use electricity, and what connection method should be used for them. ( )

Operation

1. If there are three light bulbs, how should the dry cells, switches, and wires be connected to make them light up at the same time? There may be several connection methods. Try to draw your circuit diagram.

2. Discuss whether the fluorescent lamps and fans in the classroom are connected in series or in parallel, and explain the reasons.

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Update Time: 2024-09-07

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

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