last posts

Resistors

 

Resistors

Resistors are elements that present a difficulty in passing electricity and these elements can have a fixed or variable resistance. Electrical resistance is measured in Ohms (Ω).

Resistors

Resistors have a very Ar property:

The larger around it, the smaller the electric current that passes through it.

There are many types of resistors used, and the vast majority are too small to carry their nominal value in their body. In this way, manufacturers use color coding or numeric codes to inform their value.

Even smaller resistors, which are usually of the SMD type, soldered directly to the board do not always have their nominal value printed on the body, so it is necessary to refer to the equipment's technical manual to find out the correct value.

Resistor Symbology

Resistor Symbology

How to Read a Resistor?

When reading a four-color band resistor, you need to be careful, as there is one color that is usually closer to the end than the other and this will be the first one to be considered in the reading. After identifying the color closest to the end we can associate it with the first digit of the resistor value, the second color is the second digit of the value and the third is the multiplier.

For example For a resistor that has brown, black and red color bands we will have a nominal value of 1000 Ω, as red is the multiplier. So we have the value of the digits 10 multiplied by 100Ω, resulting in 1000Ω.

How to Read a Resistor?

This simple way we will be able to calculate any value of resistors, including the 5-color ones, as they are also not different from the rule, just add a digit in your calculation verification. See the example on the next page.

Resistor Color Code Table

Below we have a table describing the digits and multipliers that we can find according to the colors existing in the resistors.

How to Read a Resistor?

SMD RESISTORS (Surface Mounting Device)

As time passes, the electronic equipment becomes smaller, and consequently the components also follow this development. Today, within this philosophy, we can easily find SMD resistors, where these components are small, soldered on the surface of the board and have the nominal value in their body more in the form of a numerical code instead of colors.

An SMD resistor with the value equal to 2512 we can associate the first three numbers as a digit (2512) and the number two is the multiplier (100Ω) totaling 25100Ω.

SMD RESISTORS (Surface Mounting Device)

Resistive Network

A Resistive Network is nothing more than several resistors interconnected within a single package, being a common terminal for all. It is used in circuits that require space saving inside the board. A Resistive Network is commonly applied to Japanese ECUs such as Honda Civic, Toyota, Mitsubishi and others.

Resistive Network


Comments



Font Size
+
16
-
lines height
+
2
-