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

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

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A power supply, a light bulb, a switch, and some 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 circuit just now, we only used one electrical appliance, but in an actual circuit, there is often more than one electrical appliance, sometimes two, three, or even more. So how to connect them to the circuit?

Definition of series circuit

As shown in the picture on the left, two small light bulbs are connected in sequence in the circuit. When one light bulb lights up, the other light bulb also lights up.

Connecting components one by one in sequence like this is called a series circuit.

series circuit

Connection points: In a series circuit, the current starts from the positive pole of the power supply, passes through the switch, the light bulb, and finally connects to the negative pole of the power supply.

Definition of parallel circuit

As shown on the left: Two light bulbs are connected in parallel in a circuit, and a switch is installed on each. A circuit in which components are connected in parallel like this is called a parallel circuit.

Characteristics of parallel circuits

The switch connected to the main road controls all electrical appliances, and the switch connected to the branch road controls the electrical appliances on the branch road.

3. Circuits in life

Most electrical appliances such as lights, fans, refrigerators, televisions, and computers in the home are connected in parallel in the circuit.

Some of the small colorful light bulbs used to decorate the room and create a happy atmosphere are combined in series and parallel.

practice

1. Find the errors and deficiencies in the circuit connection diagram below

A: The circuit is short-circuited. Although there are electrical appliances in the circuit, they are not connected to the circuit.

B: L2 in the circuit is not connected to the circuit, causing L2 to be partially open.

C: Although the circuit is connected correctly, it is easy to cause confusion due to crossed wires.

2. There are two light bulbs and a switch on a certain work table. When the switch is turned on, both lights are on. When the switch is turned off, neither light is on. The circuit connection is not visible below the table. How can you judge whether the two lights are on or off? Are the light bulbs connected in series or parallel?

3. In the corridors of residential buildings, people only occasionally pass by at night, and the lights are always on, causing a lot of waste. Researchers used "photosensitive" materials to make "light-controlled switches" that automatically close when it gets dark and automatically turn on when it gets light. Disconnect; use "sound-sensitive" materials to make a "voice-activated switch" - it automatically closes when someone walks around and makes a sound, and automatically opens when no one moves around. If these two switches are used together, the corridor lights can become "smart" ". This "smart" circuit is ( )

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"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...

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

"Connecting Series Circuits and Parallel Circuits" Understanding Circuit 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) Special..

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Update Time: 2024-07-31

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

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