Difference analysis of reactance and resistors:
1 reactance is divided into an induced resistance and capacity, and they can hinder current through the same as the resistor. Ohms are used in units and resistors. The difference is that the resistance has the same obstacle effect on all frequencies;
2 The sensing resistance and frequency are proportional – the higher the current frequency, the greater the corresponding sensing resistance;
3 The capacity and frequency are inverted – the higher the current frequency, the smaller the corresponding capacitive resistance.
Basic principle
The resistor consists of a resistor body, a skeleton and a lead end (one of the skeleton of the resistor, and the solid core resistor), and only the resistor main body is determined by the resistance. For resistors with uniform cross section, the resistance value is
In the resistance value formula, ρ is the resistivity of the resistance material (ohm · cm); L is the length (cm) of the resistor; A is a cross-sectional area of ??the resistor (square centimeter).
The thickness D of the thin film resistor is small, it is difficult to measure, ρ varies with thickness, and thus is considered to be a constant associated with the film material, referred to as a thin film resistance. In fact, it is the resistance of a square film, so it is also referred to as a square resistor (Europe / square). For uniform movies
Width of W is the width of W is the width of the film (cm)
Usually RS should be within a limited range, and excessive RS will affect the stability of resistor performance. Therefore, the cylindrical resistor body is sluched, and the planar resistor main body is used to etch the twisted pattern to extend the resistance range and perform the fine tuning of the resistance.
Voltamily characteristic graph is a graph that represents the relationship between the voltage and current of the end of the resistor. When the voltage and current are proportional (characteristics are straight), it is called a linear resistance, otherwise it is called a nonlinear resistance.
The main parameters of the parameters and characteristics characteristics of the resistor characteristics are nominal resistance and their allowable deviation, rated power, load characteristics, resistance temperature coefficient, and the like.