"Assembling Circuits" Simple Circuit PPT Courseware 4

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"Assembling Circuits" Simple Circuit PPT Courseware 4

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series circuit

Definition: Connect the components in the circuit ______. After the current flows through the first component, it flows through the other components in turn.

Features (1) The current only has a ______ path, and there is no main path or branch path; (2) The switch control in the series circuit ______; (3) Each electrical appliance in the circuit ______ each other

parallel circuit

Definition: The components in the circuit are ______ connected between two points in the circuit. The current in the circuit is divided into several branches and flows through several components respectively.

Features (1) The circuit has ______ paths; (2) The main circuit switch controls ______ electrical appliances, and the branch circuit switch controls the ______ electrical appliances; (3) Each electrical appliance ______ each other

Four ways to identify series and parallel circuits

1. Definition: If the components in the circuit are connected end to end one by one, the circuit is a series circuit; if the components in the circuit are connected in parallel, the circuit is a parallel circuit.

2. Current method: Let the current start from the positive terminal of the power supply, pass through each electrical appliance, and return to the negative terminal of the power supply. If there is no branching along the way and the current has only one path, it is a series circuit; if the current is divided into several branches somewhere and then meets somewhere, it is a parallel circuit.

3. Disassembly method: Since the electrical appliances in the series circuit affect each other, the electrical appliances in the parallel circuit do not affect each other. In a series circuit, if one electrical appliance is removed, the other electrical appliances will not work; in a parallel circuit, if one electrical appliance is removed, the other electrical appliances can still work. Based on this characteristic, the connection form of the circuit can be judged.

4. Node method No matter how long the wire is, as long as there are no electrical appliances, power supplies and other components in the middle, both ends of the wire can be regarded as the same point, so as to find out the characteristics of the connection of each electrical appliance and draw a standardized circuit diagram. This method is generally used to identify irregular circuits.

[Example] Part of the circuit of a certain household can be simplified as shown in the figure. When the three electrical appliances of light bulbs, TVs and table lamps are working, the connection method between them is ()

A.Series connection

B.Parallel connection

C. The TV is connected in series with the desk lamp and then in parallel with the light bulb.

D. The light bulb is connected in series with the desk lamp and then in parallel with the TV

Analysis: The connections of household circuits are not as easy to identify as standard circuits. It mainly depends on the working relationship between the electrical appliances: whether they work independently without affecting each other, or whether they cannot work independently, this way it is much easier to identify.

In real life, when we need the lights to be on, the TV and desk lamp may not work at the same time. Therefore, it is necessary to ensure that the three electrical appliances such as light bulbs, TVs and desk lamps do not affect each other when working, so the connection between them is in parallel.

1. In the circuit as shown in the figure, after the switch S is closed, the circuit in which the three lamps are connected in series is ()

2. As shown in the figure, light bulbs L1 and L2 are ______ connected.

3. As shown in the picture is the room card of a hotel. Only by inserting the key card into the slot can the lights and sockets in the room have power. The function of the room card is equivalent to a _____ (circuit component) connected to the main road; electrical appliances such as lights and TVs in the room are connected by _____.

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"Assembling Circuits" Simple Circuit PPT Courseware 3:

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"Assembling Circuits" Simple Circuit PPT Courseware 2:

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"Assembling Circuits" Simple Circuit PPT Courseware:

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Update Time: 2024-11-19

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

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