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1. Series circuit: a circuit composed of sequentially connecting components one by one. The characteristic is that the current flowing through one component also flows through another. For example, small colorful lights during festivals.

2. Parallel circuit: A circuit composed of components connected in parallel, characterized in that the current of the main circuit is divided into two parts at the branch and flows through each component in the two branches. For example, the connection of various household appliances.

In a series circuit, when the switch is closed, both light bulbs light up simultaneously, and when the switch is opened, both light bulbs turn off, indicating that the switch in the series circuit can control all electrical appliances. If one of the electrical appliances is damaged or disconnected, the entire circuit will become open, there will be no current in the circuit, and all electrical appliances will stop working. Therefore, in a series circuit, several electrical appliances are interrelated, either working completely or stopping working completely.

In a parallel circuit, when the switch on the main circuit is closed and the switches on each branch are closed, the light bulb will light up. When the switch on the main circuit is opened and the switches on each branch are closed, the light bulb will not light up. This indicates that the switch on the main circuit can control the entire circuit, while the switch on the branch can only control this branch.

Each path has current flowing through it, so even if one branch is disconnected, the other branch will still form a path with the main path. From this, it can be seen that in a parallel circuit, the branches are not interconnected with each other.

In short, a series connection means that when one light is on, all lights are on, and when one part is broken, all vegetables are off; Parallel connection means that the main road is broken, all vegetables are stopped, the main road is smooth, and each branch is unrelated.

1. Series circuit: a circuit composed of sequentially connecting components one by one. As shown in the figure, the characteristic is that the current flowing through one component also flows through another. For example, small colorful lights during festivals.

In a series circuit, when the switch is closed, both light bulbs light up simultaneously, and when the switch is opened, both light bulbs turn off, indicating that the switch in the series circuit can control all electrical appliances.

2. Parallel circuit: A circuit composed of components connected in parallel, as shown in the figure. Its characteristic is that the current of the main circuit is divided into two parts at the branch, and flows through each component in the two branches. For example, the connection of various household appliances.

In a parallel circuit, when the switch on the main circuit is closed and the switches on each branch are closed, the light bulb will light up. When the switch on the main circuit is opened and the switches on each branch are closed, the light bulb will not light up. This indicates that the switch on the main circuit can control the entire circuit, while the switch on the branch can only control this branch

3. Characteristics of series and parallel circuits:

In a series circuit, due to the fact that there is only one path for current, the current flowing out of the positive pole of the power supply will flow through each appliance one by one, and finally return to the negative pole of the power supply. Therefore, in a series circuit, if one of the electrical appliances is damaged or disconnected at a certain point, the entire circuit will become broken, the circuit will have no current, and all electrical appliances will stop working. Therefore, in a series circuit, several electrical appliances are interrelated, either fully working or completely stopping working.

In a parallel circuit, the current flowing out from the positive pole of the power supply needs to be divided into two paths at the branch, and each path has current flowing through it. Therefore, even if one branch is disconnected, the other branch will still form a path with the main path. From this, it can be seen that in a parallel circuit, the branches are not interconnected with each other.

How to determine whether electrical appliances in a circuit are connected in series or parallel:

Series and parallel are the two most basic forms of circuit connection, and there are certain differences between them. To determine whether the components in a circuit are connected in series or parallel, it is necessary to grasp their basic characteristics: the specific method is:

(1) Electrical connection method: Analyze the connection method of electrical appliances in the circuit, and connect them in series one by one; Parallel connection refers to the connection between two points in a circuit.

(2) Current flow method: When current flows out from the positive pole of the power supply and passes through each component in sequence, it is connected in series; When two branches are separated at a certain point and then combined together, it indicates that the circuit is in parallel.

There is only one current path in a series circuit, while there are two or more current paths in parallel.

Series connection is one of the basic ways to connect circuit components, referring to a circuit connection in which the components or parts are arranged so that all current passes through each component or part without being diverted.

In a series circuit, the current across each resistor is equal, and the sum of the voltages across each resistor is equal to the total voltage of the circuit. It is known that the voltage on each resistor is less than the total voltage of the circuit, so series resistors are used for voltage division.

In a parallel circuit, the voltage across each resistor is equal, and the sum of the currents on each resistor is equal to the total current (trunk current). It is known that the current on each resistor is less than the total current (main current), so parallel resistors are used for shunt. The series parallel connection of resistors is like water flow. There is only one path in series, and the larger the resistor, the slower the flow. The more parallel branches there are, the greater the current.

Two or more switches connected in series will form a logic and circuit. Assuming the power supply is connected to both ends of this circuit, current will only flow when all switches are closed.

Series circuit: a circuit composed of connecting components one by one in sequence. As shown in the figure, the characteristic is that the current flowing through one component also flows through another. For example, small colorful lights during festivals. In a series circuit, when the switch is closed, both light bulbs light up simultaneously, and when the switch is opened, both light bulbs turn off, indicating that the switch in the series circuit can control all electrical appliances.

Parallel circuit: A circuit composed of components connected in parallel, as shown in the figure. Its characteristic is that the current of the main circuit is divided into two parts at the branch, and flows through each component in the two branches. For example, the connection of various household appliances. In a parallel circuit, when the switch on the main circuit is closed and the switches on each branch are closed, the light bulb will light up. When the switch on the main circuit is opened and the switches on each branch are closed, the light bulb will not light up. This indicates that the switch on the main circuit can control the entire circuit, while the switch on the branch can only control this branch.

The characteristics of series and parallel circuits: In a series circuit, due to the fact that there is only one path for current, the current flowing from the positive pole of the power supply will flow through each electrical appliance one by one, and finally return to the negative pole of the power supply. Therefore, in a series circuit, if one of the appliances is damaged or disconnected at a certain point, the entire circuit will become broken, the circuit will have no current, and all appliances will stop working. Therefore, in a series circuit, several appliances are interrelated, either fully working or completely stopping working. In a parallel circuit, the current flowing out from the positive pole of the power supply needs to be divided into two paths at the branch, and each path has current flowing through it. Therefore, even if one branch is disconnected, the other branch will still form a path with the main path. From this, it can be seen that in a parallel circuit, the branches are not interconnected with each other.

Series voltage divider, parallel current divider.

Principle: In a series circuit, the current across each resistor is equal, and the sum of the voltages across each resistor is equal to the total voltage of the circuit. It is known that the voltage on each resistor is less than the total voltage of the circuit, so series resistors are used for voltage division.

In a parallel circuit, the voltage across each resistor is equal, and the sum of the currents on each resistor is equal to the total current (trunk current). It is known that the current on each resistor is less than the total current (main current), so parallel resistors are used for shunt. The series parallel connection of resistors is like water flow. There is only one path in series, and the larger the resistor, the slower the flow. The more parallel branches there are, the greater the current.

Method for determining whether electrical appliances in a circuit are connected in series or parallel:

Series and parallel are the two most basic forms of circuit connection, and there are certain differences between them. To determine whether the components in a circuit are connected in series or parallel, it is necessary to grasp their basic characteristics. The specific method is:

(1) Electrical connection method: Analyze the connection method of electrical appliances in the circuit, and connect them in series one by one; Parallel connection refers to the connection between two points in a circuit.

(2) Current flow method: When current flows out from the positive pole of the power supply and passes through each component in sequence, it is connected in series; When two branches are separated at a certain point and then combined together, it indicates that the circuit is in parallel.

(3) Component removal method: Remove any electrical appliance and check if other appliances are working properly. If all appliances have been removed and other appliances can continue to work, then the connection relationship between these appliances is parallel; Otherwise, it is a series connection.

(4) Using stroke lines instead of wires, if a single wire can connect all electrical appliances together, it is called series connection; if not, it is called parallel connection.

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