"Assembling Circuits" Simple Circuit PPT Courseware

Description

"Assembling Circuits" Simple Circuit PPT Courseware

Knowledge review

Exercise: Try to draw the corresponding circuit diagram in the box based on the physical connections in the picture.

Observe and think

Experiment 1: Use the following experimental equipment to assemble a circuit and use a switch to control two light bulbs at the same time so that they light up and go out at the same time. How many connection methods are there? First draw the circuit diagram and then connect the physical objects.

Series connection: The electrical appliances are connected end to end and connected in series to connect to the circuit.

Parallel connection: Both ends of the electrical appliance are connected to the circuit.

(Introduction to main roads and branch roads)

Physical connection methods of series and parallel circuits

Draw a circuit diagram that meets the requirements according to the meaning of the question

1. If it is a series circuit, start from the positive pole (or negative pole) of the power supply and connect each component in series to the circuit.

2. If it is a parallel circuit, first select a more complicated branch to form a loop with the main circuit, and then connect the remaining branches at both ends of the designated circuit.

think

1. Do the electrical appliances in the series circuit affect each other?

Influence each other, as long as one part is disconnected, all electrical appliances will not work.

2. Do the electrical appliances in the parallel circuit affect each other?

The branches do not affect each other. If one branch is disconnected, the other branches can still work.

Observe and think

Experiment 2: Use the following experimental equipment to assemble a circuit so that the on and off of the two light bulbs do not affect each other and can be controlled independently. Draw the circuit diagram and connect it to the real object.

Summary (notes)

Basic connection method of circuit:

1. Series connection - the electrical appliances are connected end to end and connected in series together to connect to the circuit.

Features: There is only one path for each electrical appliance to influence each other.

2. Parallel connection - Connect both ends of the electrical appliances to the circuit.

Features: Each branch does not affect each other, and there are more than two paths.

Thinking 1: Are the lights and fans in the classroom connected in series or in parallel? Why?

Thought 2: Are the street lights on the road connected in series or in parallel? Why?

do you know?

Most of the electrical appliances in our homes are connected in parallel. Do you know why?

How to determine whether electrical appliances are connected in series or parallel? Talk about it

Practice in class

When ______ is open and ______ is closed, the two lights are connected in series. When ______ is open and ______ is closed, the two lights are connected in parallel. When S1, S2, and S3 are all closed, the circuit will cause ______ and burn out the power supply.

When ______ is open and ______ is closed, the two lights are connected in series. When ______ is open and ______ is closed, the two lights are connected in parallel. When S1, S2, and S3 are all closed, the circuit will cause ______ and burn out the power supply.

When the hair dryer switch touches 2 and 3, it blows ____ wind; if it touches ____, it blows hot air; if it touches 1 and 2, the hair dryer blows ____.

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"Assembling Circuits" Simple Circuit PPT Courseware 4:

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"Assembling Circuits" Simple Circuit PPT Courseware 3:

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Update Time: 2024-10-20

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

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