Resistors 1,225,090+ Parts

Resistor Category Description

Resistors are essential basic components in electronic circuits, which realize various circuit functions by controlling current and voltage. Dasenic provides the following types of resistors and related products: chassis mount resistors, chip resistors and surface mount resistors, special resistors, through-hole resistors and resistor network & array solutions.

Resistor Definition

Resistor is one of the most basic and common passive components in electronic circuits, used to limit current, divide voltage and adjust the resistance of the circuit. Resistors consume current by converting electrical energy into heat energy, thereby achieving control of current and voltage.

Structure of Resistor

The basic structure of a resistor includes a resistive material (such as carbon film, metal film or wire wound material) and two pins. The properties and geometric dimensions of the resistive material determine the resistance value of the resistor.

Classification of Resistors

Fixed Resistors: Resistors with fixed resistance values ​​that cannot be adjusted. Widely used in all circuits to control current and voltage.

Variable Resistors: Resistors with adjustable resistance values, including potentiometers and adjustable resistors. Used to adjust voltage, current and signal strength in circuits.

Thermistor (NTC/PTC): A resistor whose resistance changes with temperature. Used in temperature sensors and overheat protection circuits.

Photoresistor: A resistor whose resistance changes with light intensity. Used in light sensors and light-operated switches.

Varistor (VDR): A resistor whose resistance changes with applied voltage. Used in overvoltage protection, lightning protection, etc.

Power resistor: A resistor that can withstand high power. Used in power supply circuits, load testing, etc.

Resistor identification

Resistors usually indicate their resistance directly through color rings, digital codes, or text.

Color ring identification: Commonly found in small resistors, the resistance value is indicated by a series of colored rings. The standard four-ring color code is as follows:

The first and second rings: indicate the first two digits of the resistance value.

The third ring: indicates the multiplication factor.

The fourth ring: indicates the tolerance (error range).

Digital coding: Some chip resistors use three or four digits to represent the resistance value, for example:

"103" means 10 × 10³ Ω = 10 kΩ.

They play a key role in power control, signal processing, temperature detection, etc. Choosing the right resistor requires considering its resistance value, tolerance, power rating, and application scenario to ensure the normal operation and reliability of the circuit.