What is the nature of resistor?

Last Update Time: 2019-01-19 16:35:21

A resistor is a physical component that has a certain resistance, a certain geometry, and certain performance parameters that impede the current in the circuit. In the circuit, its main function is to stabilize and regulate the current and voltage in the circuit, as a shunt, voltage divider, temperature detection, overvoltage protection and power consumption load.


Most of the resistor leads are axial leads and a small part are radial leads. In order to meet the needs of modern surface mount technology (SMT), there is also a "no lead" chip resistor (called a footless part).


The resistor body has a carbon film,a metal film, etc., and has a cylindrical shape and a rectangular sheet shape. The resistor is a non-polar component, and the resistance of the resistor can be identified in the component body by a color ring or a direct standard method.

Resistors commonly used in circuit design can be classified into metal film resistors, carbon film electrical devices, wire wound resistors, potentiometers, network resistors, and thermistors. Different resistors not only have different resistance values, but also different functions, so different resistors cannot be replaced casually.

The resistance has 1/8W, 1/4W, 1/2W, 1.5W, 1W, 2W according to resistor’s power. The larger the power, the larger the resistance shape. The components with dissipated power of 1W or more than 1W must not be contact with the printed board. In case of contact, the corresponding heat dissipation measures should be taken before installation.

The unit of resistance is ohms (Ω), and kilohms (kΩ), megaohms (MΩ), etc. are often used to mark resistors with different resistance values.


Conversion formula: 1MΩ=1000kΩ=1000000Ω.


The power unit of the resistor is watts (W). The power of the resistor indicates how much energy the resistor can release under normal conditions. The higher the power, the more energy is released. Note that in the replacement of resistors, low-power resistors cannot be used instead of high-power resistors (in the case of the same resistance value), and high-power resistors can be used instead of low-power resistors. Under normal circumstances, the rated power of the selected resistor should meet the power requirements of the design circuit, and the power of the resistor cannot be increased or decreased.


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