This paper briefly describes the meaning of series circuit and parallel circuit and the characterist

Series circuit: Several circuit elements are connected to each other along a single path, and each node is connected to a maximum of two components, this connection method is called series connection. Circuits that are connected in series are called series circuits.

The current flowing through each resistor in a series circuit is equal. Because each section of the same branch in a DC circuit has the same current intensity.

Series circuit features:

The switch controls the entire circuit at any location, i.e. its role is independent of its location. There is only one path for the current, and the current that passes through one lamp must pass through the other. If one light goes out, the other must go out.

Parallel circuit: Parallel connection is to connect the two terminals of each of the two or more two-terminal circuit elements to a pair of common nodes respectively in the connection mode shown in Figure 1, and the figure shows the parallel connection of n two-terminal components. They are connected to a pair of common nodes, which in turn are connected to the rest of the circuit.

Parallel characteristics: The terminal voltage of all parallel components is the same voltage, that is, V in the circuit shown.

The total current of a parallel circuit is the sum of the currents of all the components. In the circuit shown, i is the total current, i1, i2, i3 are the currents of the component, i=i1+i2+i3.

The series circuit is to connect the components according to a circuit, and the parallel circuit is to connect the components according to several different circuits. That's about it!

The current of the series circuit is equal everywhere, the sum of the voltages at both ends of each component is equal to the power supply voltage (this is without considering the internal resistance, if you are a junior high school student, you don't need to consider the internal resistance), and the total resistance is equal to the sum of the resistances of the individual components.

The current on the trunk of the parallel circuit is equal to the sum of the currents on each branch, the voltage at both ends of the trunk circuit is equal to the voltage at both ends of each branch, and the reciprocal of the total resistance is equal to the sum of the reciprocal resistance on each branch.

In series circuits.

Current (i) Voltage (u) Resistance (R).

i=The currents of all parts are equal.

u = the sum of the voltages of the parts.

r = the sum of the resistances of the parts.

When multiple resistors are connected in series into a circuit, they act as voltage dividers.

In parallel circuits.

Current (i) Voltage (u) Resistance (R).

i = the sum of the currents of the parts.

u=The voltages of all parts are equal.

r = multiply the resistances of the parts and divide by the sum of the resistances of the parts.

1. Series characteristics: there is only one current path in series; The components in the series circuit interfere with each other and cannot work separately; In a series circuit, one switch controls all circuits;

2. Parallel connection characteristics: the parallel current is more than 1 current path; The parallel branches do not interfere with each other and can work independently; A switch connected in series in the trunk controls all circuits, while a branch controls only the branch in which it is located.

And what is the difference between the current in a series circuit and a parallel circuit?

1) The current flowing through each resistor is equal. Because each section of the same branch in a DC circuit has the same current intensity. (2) The total voltage (the voltage at both ends of the series circuit) is equal to the partial voltage (the current flow method is usually used to determine the connection of each circuit.

If the current passes through each consumer in sequence without shunting, the consumer is connected in series; If the current through the consumer is bifurcated, i.e., the current passing through each consumer is part of the total current, then the electricity is connected in parallel. When judging the connection of a circuit, it is usually possible to use a wire to connect two points of the circuit, and in the junior high school stage, the resistance of the wire can be ignored, so it is possible to see the two points connected by a wire as a point, so sometimes it is convenient to use the "node" method to judge the connection of the circuit.

The series connection of the resistor has the following characteristics: (refers to the series of R1, R2, the more strings, the greater the resistance) Current: i=i1=i2 (the current is equal everywhere in the series circuit) Voltage:

U=U1 U2 (Total Voltage is equal to the sum of the voltages everywhere) Resistance: R=R1 R2 (Total Resistance is equal to the sum of all resistors) If n equivalent resistors are connected in series, then there is R Total = Nr

Partial pressure effect:=; Calculate u1, u2, available:;

Proportional relationship: current: i1:i2=1:1

The parallel connection of resistors has the following characteristics: (refers to R1, R2 in parallel, and the more they are combined, the smaller the resistance) Current: I=I1 I2 (Dry current is equal to the sum of the currents of each branch) Voltage:

U=U1=U2 (Trunk Voltage is equal to the voltage of each branch) Resistance: (The reciprocal of the total resistance is equal to the sum of the reciprocal of each resistor) If n equivalent resistors are connected in parallel, then there is r total = r

Diversion effect:; Compute i1, i2 available:;

Proportional relationship: voltage: u1:u2=1:1

1. What are the characteristics of parallel connection and series connection: there is only one current path in series; The components in the series circuit interfere with each other and cannot work separately; In a series circuit, one switch controls all the circuits. Parallel features:

There is more than 1 current path in parallel; The parallel branches do not interfere with each other and can work independently; The switch connected in series in the trunk circuit controls all the circuits, while the branch in the branch controls the branch where it is located. 2. Precautions for circuit transformation 1. If it is necessary to transfer the position of the switch socket, it is strictly forbidden to seal the original road box. Changing the position of the switch socket involves the traction and protection of the line, as we all know that the wire is through the line pipe, if there is a problem in the later stage, the wire can be directly pulled out of the line pipe for maintenance.

If the original socket box is sealed, the wire cannot be pulled out, and there is no way to repair it in the future. 2. It is best not to use the terminal in the wire pipe, if the terminal head should be added to the passing box or replace the long wire. It is necessary to pay attention to the decoration and laying of dark wires, the line pipe is not open to have a terminal head, because the terminal head is placed in the line pipe, if there is a problem, it is difficult to detect early tremor detection, even if it is detected and repaired.

Therefore, the terminal must be equipped with a passing box or replace the original wire with a long wire to prevent the terminal in the conduit. 3. The high-power power supply is suitable for single-channel control. High power [ ooo

A parallel circuit is a circuit in which there is more than one independent path of current between the components of the circuit that make up the parallel. The electrical appliances used in series circuits are connected in the circuit end to end, and the circuit has only one path.

First, the characteristics of the series circuit1. The current is equal everywhere in the series circuit.

2. The total voltage in the series circuit is equal to the sum of the voltages of each part of the circuit.

3. The total resistance in the series circuit is equal to the sum of the resistance of each part of the circuit.

4. The voltage at both ends of each part of the circuit in the series circuit is proportional to its resistance.

Second, the characteristics of parallel circuits1. The total current in the parallel circuit is equal to the sum of the currents in each branch.

2. The voltages at both ends of each branch in the parallel circuit are equal.

3. The reciprocal of the total resistance of the parallel circuit is equal to the sum of the reciprocal resistance of each branch.

4. In the parallel circuit, the current flowing through each branch is inversely proportional to its resistance.

3. The mantra of series and parallel1.Tandem formula: end to end, strung together. Head to tail, one by one.

Current: The current is equal everywhere in a series circuit.

Voltage: The total voltage in a series circuit is equal to the sum of the voltages of the circuit parts.

Resistance: The total resistance in a series circuit is equal to the sum of the resistances of the circuit parts.

Voltage Divider Law: The voltage at both ends of each part of the circuit in a series circuit is proportional to its resistance.

2.Parallel formula: head to head, tail to tail. The head head is connected, and the side by side is connected between two points.

Current: The total current in the parallel circuit is equal to the sum of the currents in each branch.

Voltage: The voltage at both ends of each branch in a parallel circuit is equal.

Resistance: The reciprocal of the total resistance of the parallel circuit is equal to the sum of the reciprocal resistance of each branch.

Shunt Law: In a parallel circuit, the current flowing through each branch is inversely proportional to its resistance.