The function of the adjustable resistor at the point in the circuit is quite extensive. The function of the adjustable resistor is mainly that he can not only be used alone in the circuit, but also with various electronic components together with various functions in the circuit. Circuit. The
One, say adjustable resistor
The fundamental role of the adjustable resistor in the circuit is to provide the circuit with a resistor, which is a physical quantity.
What is a tunable resistor? It is also commonly referred to as a resistor. In a general sense, an adjustable resistor can act as a resistance to current flow in a circuit.
For conductors, the presence of a tunable resistor uses the resistance encountered in the current flow, which is characterized by the fact that the resistor consumes electrical energy. Obviously, in this sense, the effect of the adjustable resistor is negative. However, this feature of the adjustable resistor is used in the circuit to achieve many specific circuit functions.
Adjustable resistors are used to provide a component with a resistor for the circuit. The tunable resistor uses the power to dissipate the current in the circuit. The
Second, the concept related to adjustable resistors
The related knowledge about adjustable resistors mainly explains the following points:
1. The circuit symbol of the adjustable resistor and the representation method of the power. The adjustable resistor has the size of the size. The unit is ohms, which is represented by the symbol “Ω”. Besides ohms, there are also kiloohms (kΩ) and MΩ. (MΩ), the conversion relationship between them is as follows:
1kΩ = 1000Ω
1MΩ=1000kΩ
2. Another way to represent the adjustable resistor is to conduct the conductance. The conductance is represented by the letter “G”, which is numerically equal to the reciprocal of the adjustable resistor, the unit of the adjustable resistor is ohms, and the unit of conductance is Siemens. (ohm).
3. In general, objects that can conduct electricity become conductors, such as wires for lighting. The resistivity of the conductor is very small, and the resistivity of different materials is different, that is, its electrical conductivity is different, and the resistivity of the superconductor is very small.
4, the insulator is not conductive objects, crack glass, as well as dry wood. The point resistance of the insulator is very large. He is exactly the opposite of conductors.
5, in the circuit analysis, in order to express the convenience, the adjustable resistor referred to as the resistance, such as adjustable resistor R1, we directly use the "resistor R1" said. The
Third, the concept of semiconductor
The material with the conductive capability between the conductor and the insulator is called a semiconductor material, and a large number of semiconductor materials are used in the electronic circuit. For example, a frog is a semiconductor material. Active devices such as crystal diodes, transistors, and integrated circuits that can be seen in electronic circuits are manufactured using this semiconductor material.