Popular Knowledge, SMD Resistor Marking Interpretation, Read Resistance Value at a Glance

Resistance, which indicates the magnitude of a conductor's impediment to electric current. In physics, resistance represents the conductor's ability to conduct electricity, represented by the symbol R. The basic unit is the ohm (symbol Ω), and there are units larger than the ohm, such as the kilo-ohm (symbol KΩ) and megohm (symbol MΩ). The unit conversion relationship is: 1MΩ = 1000KΩ = 1000,000Ω.

Resistors are widely used in various circuits, especially in low-voltage electronic equipment is more common, optical cats, routers, network set-top boxes and other electronic equipment. From the previous tube TV to the radio, the circuit board used in the resistor volume is large, some resistors directly marked on the resistance value of the resistor, some with a colour ring to indicate the resistance value of the resistor. Popular science knowledge, take you to know the colour ring resistor, instantly read the resistance value

With the miniaturisation of electronic equipment, integrated development, the volume of larger resistors are getting smaller and smaller, electronic equipment in the resistance gradually began to use chip resistors. Chip resistors are generally a thin black film, the ends are silver welding leads. Chip resistors are small, lightweight, stable and reliable, suitable for automated production line assembly.

Common chip resistors, some of which are marked with three digits, the error of this resistor is generally ±5%, the first two expressed in the first two digits of the resistor, the third digit indicates how many zeros behind, the unit is Ω. Such as 103, indicating that 10,000 Ω = 10K Ω, the error of ±5%. Tolerance ± 1% of the precision resistor, it is expressed in four digits, so that the first three digits of the resistor is the first three digits of the resistance value, and the fourth digit indicates how many zeros are behind. Such as 5112, said 51100Ω = 51.1KΩ, error ± 1%.

In addition to the above two chip resistors, there is a chip resistor, between the numbers have the letter R. This resistor, generally less than 10 ohms of resistance, R represents the decimal point. Such as 6R2, that the resistance value is 6.2Ω, 0R56, that the resistance value is 0.56Ω. Resistor on the three-digit error ± 5%, four-digit error is ± 1% (note that the letter R is also counted as a number).

The above is a chip resistor, the meaning of the above logo interpretation, know the meaning, take a look at a glance can instantly read out the size of the resistance value.