How to draw a series circuit and a parallel circuit 3 20

In series, you only need to draw each circuit element in turn (series, that is, to connect each part into a closed circle).(If the requirements are not high, the components may not be drawn in order).

Parallel: 1. Draw each branch; 2. Connect each branch in parallel (the method of parallel connection is: connect any 2 ends of each branch, and immediately lead out a wire head at any place on the connected line; Then use the same method to lead out the remaining thread); 3. Connect the remaining parts in series (the so-called series connection is to connect the power supply, parallel parts, switches, etc. into a closed circle).

In parallel circuits, the current starts from the positive pole and there is only one way to return to the negative pole.

In a series circuit, the current starts from the positive pole, has a fork in the middle, and then returns to the negative pole.

When connecting the circuit, start from the positive pole of the battery pack and wire it in the direction of the current.

The simplest series of wire connection is the simplest series circuit, and the two electrical appliances are connected in parallel, and then the power switch wire is connected in series to form a parallel circuit at the wire joints of the two electrical appliances.

The series circuit diagram is as follows:

1. Look at the real thing and draw the circuit diagram.

2. Look at the diagram and make a drawing of the components.

3. Design the circuit according to the requirements.

4. Identify the wrong circuit and draw the correct diagram.

In general, the above four kinds of Hu rules are illustrated in the general exam, and their drawing methods are explained in detail below.

1) Look at the real thing to draw the circuit diagram, the key is to look at the diagram, the diagram can not be understood, you can not make a good diagram, there is an internal regulation of the high school entrance examination, mixed drawing is not required, then you should understand the truth.

There are actually only two circuits in the picture, one in series and the other in parallel.

The series circuit is very easy to distinguish, first find the positive terminal of the power supply and use the tip of a pencil to advance the current direction in order until the power supply is negative.

So far, clarify the position of each component, and then make a drawing, the order is: first draw the battery pack, according to the order of the components to standardize the drawing, horizontal and vertical, there shall be no components outside the turn if there is a voltmeter.

Want. Accurately judge the table of other continents which can be a section by the road by the birth of the incense inspection circuit in the case of the incense inspection circuit will be by the bed table well by the continent by the road at both ends of the well connection by the road semi-broken method to add the cloth from the source.

The pole starts and finds the bifurcation point in the direction of the current. And mark the Chinese word "分". (Ignore it when encountering the voltmeter, when disconnected without external care) with two pencils starting from the equinox along the direction of the current forward.

Enter, until the two nibs meet, this point is the confluence point, and mark the Chinese "合" character, first of all, clear pants Hengchu has several branches, how many elements in each branch, what are they, especially to.

Note that the equinox point to the positive pole of the power supply is a trunk road, and the equinox point to the negative pole of the power supply is also a trunk circuit.

The steps are as follows: first draw the battery pack, draw two sections of trunk roads, draw what is in the trunk road, draw branch roads between the equinox and the junction points, and draw a few (in most cases, only.

Two branches) and accurately draw the components in each branch in order, the drawing requires horizontal and vertical, and the voltmeter is drawn to both ends of the circuit under test after the pencil drawing is checked correctly.

The series circuit diagram is as follows:

1. Regard the voltmeter as an open circuit and the ammeter as a wire, draw the direction of the current pulse, and judge that this is a series circuit.

2. According to the order of current flow (positive outflow, negative inflow), draw the circuit components (including power supply, switch and ammeter) in turn.

3. If there is a voltmeter in the series circuit, start to remove the voltmeter and not look at it. Finally, on the standard diagram, the voltmeter symbol can be connected in parallel at both ends of the measured electrical appliances, and pay attention to the black dots at the intersection line.

Attention should be paid to drawing circuit diagrams: it is necessary to use the unified components to hold the mu symbol; The wiring of the leather stool should be drawn horizontally and vertically, and it is roughly rectangular; The distribution of circuit components should be symmetrical, symmetrical and beautiful; Generally, the components are drawn on each horizontal line; The cross-connection of the wire must be painted black; With the exception of the sliding rheostat, other circuit components cannot be drawn around corners.

The most simple series circuit is the circuit in which two electrical appliances are connected sequentially; The simplest parallel circuit is the one in which two bulbs are connected in parallel in a row, as shown in the figure below

Summary. How to draw the circuit diagram of indirect series and indirect parallel.

1. Parallel circuit, that is, several components are connected to the same power line, as shown in Figure 1. 2. Series circuit, spring limb is to connect the head and tail of Yuanzhou trousers, as shown in Figure 2.

What is the difference between indirect tandem and tandem drawing?

Or in other words, there will be indirect tandem.

Indirect? Electromagnetic implementation?

This is indirect.

Law. It is the indirect series and indirect parallel connection in "series and reverse parallel".

This is direct series and parallel.

This is a secondary conclusion of Ohm's law for closed circuits in dynamic circuits. This conclusion is foolproof when the power supply has internal resistance, I am afraid that in the case of ignoring the internal resistance, it is not universal, and it will be distracted to make wrong conclusions, such as the resistance of the direct and non-internal resistance power supply in parallel, no matter how the rheostat changes, the voltage and current on it remain unchanged. The focus of this conclusion is to identify series and parallel, and the series and parallel connections in this conclusion are not series and parallel in the usual sense, but in the generalized sense of series and parallel.

In the hybrid state, starting from the power supply, everything that can be connected to the rheostat to form a circuit is connected in series, and everything that cannot be connected to a circuit is connected in parallel.

1. The definitions are different.

Series Connection: Series connection is one of the basic ways to connect circuit components. Circuit components (such as resistors, capacitors, inductors, electrical appliances, etc.) are connected one by one.

The circuit composed of connecting various electrical appliances in series is called a series circuit. In a series circuit, the current through each consumer is equal.

Parallel: Parallel connection is a connection method between components, which is characterized by connecting two components and devices of the same or different classes, and at the same time, the tail and tail are also connected. It is usually used to refer to the way in which the electronic components in a circuit are connected, that is, parallel circuits.

2. The characteristics are different.

Serial connection: A connection in which two or more components are arranged in a string, and the first end of each component and the tail of the previous component are connected to form a node, and this node is no longer connected with other nodes.

the first end of the element 3 and the end end of the element 2 are connected to form a node q; The root end of element 2 and the tail end of element 1 are connected to form node p. The first end A of Element 1 and the last end B of Component 3 are connected to the other nodes of the circuit, respectively.

Parallel: Paralleling is the connection mode that connects the two terminals of each element of two or more two-terminal circuit elements to a pair of common nodes, and they are connected to a pair of common nodes, and the pair of nodes are connected to other parts of the circuit respectively.

3. The principle is different.

Series connection: In a series circuit, the currents on each resistor are equal, and the sum of the voltages at both ends of each resistor is equal to the total voltage of the circuit. It can be seen that the voltage on each resistor is less than the total voltage of the circuit, so the series resistors divide the voltage.

Parallel: In a parallel circuit, the voltages at both ends of each resistor are equal, and the sum of the currents on each resistor is equal to the total current (trunk current). It can be seen that the current on each resistor is less than the total current (trunk current), so the shunt resistor is shunt.

The series-parallel connection of the resistors is like the flow of water, there is only one road in series, the greater the resistance, the slower the flow, the more branches in parallel, the greater the current.

1. The simple parallel circuit diagram is as follows:

The main characteristics of parallel circuits are:

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

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

Second, the simple series circuit diagram is as follows:

The main characteristics of series circuits are:

1. The current in all series elements is the same current, i total = l1 = l2 = l3 = ......= ln。

2. The total voltage of the components in series is the sum of the terminal voltages of all the components, and the total U = U1 + U2 + U3 + ......un。

In the circuit illustrated, u is the total voltage, and u1, u2, and u3 are the voltages of the components, u=u1+u2+u3.

Electricity is usually used to determine the connection of the circuit.

Flow direction method. 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.