Do you have any accurate and convenient judgment tips for series parallel circuits?

The series circuit is very easy to identify, first find the positive pole of the power supply, use a pencil to parallel the circuit, the judgment method is as follows, starting from the positive pole of the power supply, find the bifurcation point along the current direction, and mark the Chinese "minute" character, (meet the voltmeter ignore it, when disconnected without treatment) use two pencils to start from the equinox point along the current direction to advance, until the two nibs converge, this point is the confluence point tip along the current direction sequentially until the negative pole of the power supply.

It is better to use the method of looking at the node, which is similar to the wire connection point of the intersection. The nodes that appear are parallel circuits, otherwise they are series circuits. Or observe that the current can have several paths from the positive electrode to the negative electrode, if there is only one, it is in series, otherwise it is in parallel.

Later, when you become proficient, you will be able to distinguish it very quickly.

Look at the circuit diagram and connect the components to make a diagram Method: first look at the diagram to understand the circuit: the mixed connection is not allowed to be tested, there are only two kinds of series and parallel connection, and the focus is on parallel connection for easy identification of series connection.

If it is a parallel circuit, find the equinox and junction points on the long circuit length and mark them. and clarify the location of each component. (First of all, figure out whether there is an open and ammeter in the trunk road) connect the physical diagram, first connect the battery pack, find out the positive pole of the power supply, start from the positive pole, connect the trunk components, find the sub-point, the branch road is connected, do not scribble, and draw in order.

Until the junction point, and then draw another branch [note that the wires must not be crossed, the wires must be drawn to the terminal post (switch, ammeter, voltmeter, etc.) to connect to the ammeter, and the voltmeter should pay attention to the positive and negative terminals] When encountering a sliding rheostat, it must be drawn on and down, and after checking that the circuit is correct, the voltmeter must be connected to both ends of the circuit under test.

5 ways to determine a series-parallel circuit.

Current analysis method: when identifying the circuit, the current: the positive pole of the power supply, the negative pole of the power supply, if the electrical appliances are not shunted on the way, they are connected in series; If the current is diverted at a certain point, there is only one consumer for each branch, and these appliances are connected in parallel; If there is more than one electrical appliance in each branch, then the circuit is connected in series, which is called a hybrid circuit.

Disconnection method: remove any electrical appliance, if the other electrical appliance is not working, the two electrical appliances are connected in series; If the other consumer is not affected and still working, the two consumers are connected in parallel.

Node method: When identifying the circuit, no matter how long the wire is, as long as there is no electrical appliance or power supply in between, the two ends of the wire can be regarded as the same point, so as to find out the common point of each electrical appliance.

Observation structure method: the electrical terminal is numbered, the current inflow end is the "head" and the current outflow end is the "tail", and the electrical appliances are observed, if the "head and tail and the end of the tail" are connected in series; If the "head, head", "tail, tail" are connected, it is in parallel.

Empirical method: For circuits that cannot actually be connected, such as street lights and home circuits, the connection can be judged according to some of their characteristics.

Determine the method of series-parallel circuits.

1. Remember and skillfully use the mantra: "In a series circuit, the current is equal everywhere; On parallel circuits, the voltages are equal everywhere. ”

2. Think of the wire in the diagram as a bendable and flexible wire. When lifting both ends up.

3. The components of the series circuit are connected head to tail, and the "head" of a component is grasped with one hand; Grab the "tail" of another element with the other hand.

4. The components of the parallel circuit are connected with the head and tail and tail, grasping all the "heads" with one hand and the "tails" of all components with the other hand.

Series and parallel connection 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 base-drain original characteristics. Here's how:

1. Electrical appliance connection method: analyze the connection method of electrical appliances in the circuit, and connect them in series one by one; Parallel between two points in a circuit is parallel.

2. Current flow method: when the current flows out of the positive pole of the power supply, it is connected in series if it flows through each element of the balance reckless parts in turn; When two branches flow through a branch at a certain point and finally merge together, it indicates that the circuit is in parallel.

<> set up a zen in the series circuit, close the switch, the two bulbs emit light at the same time, and the two bulbs are extinguished when the switch is disconnected, indicating that the switch in the series circuit can control all the electrical appliances.

2.Parallel circuit: the circuit composed of connecting the components in parallel, as shown in the figure, is characterized by the fact that the current of the trunk circuit is divided into two parts in the branches, and flows through each element in the two branches respectively. For example: the connection of various electrical appliances in the home.

The easiest way to do this is to start with the positive end of the power supply. Follow the traverse. {voltmeter not counted} All electrical appliances are connected together, there is no bifurcation, and the one that can return to the negative pole is connected in series.

There are forks, but they can converge together after a while, and finally return to the negative pole, which is parallel.

Series circuits:

There is only one path for the current; As long as there is one disconnection, the entire circuit is disconnected;

The total voltage at both ends of the circuit is equal to the sum of the voltages of the individual series resistors;

The current intensity at each point on the circuit is equal;

The total resistance of the circuit is equal to the sum of the individual resistors.

Parallel circuit: the current has multiple paths; If one passage is disconnected, it does not affect the disconnection of other pathways;

The voltage at both ends of each branch is equal;

The total current of the trunk circuit is equal to the sum of the currents of each branch;

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