Basic knowledge of circuit[汽车维修常识]

The circuit consists of power supply, electrical appliances,switchIt is composed of wires, where the power supply is a device for power supply. With the power supply, there can be continuous current in the circuit; the role of the wire is to conduct current, which is the channel of the current; the electrical appliance is the device that uses the current to work; the switch is also called Electric key, its function is to control the on and off of current in electrical appliances. In a complete circuit, the four components of power supply, electrical appliances, wires and switches are indispensable.car repairHome
Circuit connection is an important basic skill for learning circuit knowledge. The connection circuit must have a certain sequence to make the operation orderly and easy to check. To check whether the circuit is connected correctly or not, it is necessary to use the knowledge learned in elementary school common sense, that is, "The current in the circuit always flows from the positive pole of the power supply, and flows back to the negative pole of the power supply through the electrical appliance." If the current cannot flow through the circuit smoothly Return to the negative pole of the power supply, where it is stuck, the problem is there, use the "current method" to check the connection of the circuit, you can achieve clear thinking and easy operation.
The purpose of connecting the circuit is to ensure that the electrical appliances can work smoothly with the current. Therefore, it is not only required to connect the components correctly, but also to pay attention to the connection between the components and the wires to prevent poor contact or open circuit.
Circuit diagram
Draw the corresponding circuit diagram according to the actual circuit, or connect the actual circuit according to the given circuit diagram, which is an important basic training.
To draw a circuit diagram:
(1) Standard and clear. Circuit components should use uniformly prescribed symbols and be drawn correctly. For example, the positive electrode of the battery should be represented by a thin and long line, the negative electrode should be represented by a short and thick line, and the crossed and connected wires should be drawn black at the intersection. point.
(2) Neat and beautiful. The wiring of the circuit diagram should be straight and the corners should be angular. The entire circuit diagram is best to be rectangular, the positions of the components should be arranged properly, and the components should not be drawn on the corners. The connection between the wire and other components cannot be disconnected, etc.
(3) It should be consistent with the actual circuit connection and working status. In the actual circuit, which component is connected to the positive pole of the power supply, the circuit diagram should also be connected to which component; in the actual circuit, if the electric key is closed or disconnected, the electric key symbol in the circuit diagram should also display the corresponding state.
Series circuit and parallel circuit
The connection method of series circuit and parallel circuit are different, so they have different characteristics. In a series circuit, the current passing through one element also passes through another element; if one of the elements fails, no current flows through the entire circuit.
For a parallel circuit, when the circuit is turned on, the main circuit current is divided into two parts at the branch. One part of the current flows through the first branch, the other part flows through the second branch, and then merges into the main current. , Which flows back to the negative pole of the power supply. Even if some components on the branches in the parallel circuit are broken, it will not affect the operation of the components on the other branches, and the components on the other branches still have current flowing. carMaintainer's House

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