# Understanding resistance element

Resistors, also known as resistors, belong to current limiting devices. In daily design and development, resistors are mainly used to limit current and partial voltage. Understanding resistance is very important in circuit design.
There are many kinds of resistors, which can be classified from materials, packaging and uses. From the material, mainly thin film resistance, cement resistance, wire wound resistance; From the package, can be divided into plug-in class, table paste class; From the use of points, thermistor, photoresistor and so on. The specific application should be selected according to the power size and purpose of the application.
Reading THE RESISTANCE VALUE OF THE COLOR RING RESISTOR IS AN IMPORTANT SKILL IN THE PROCESS OF RECOGNIZING THE RESISTANCE. It allows you to identify the resistance value of the resistor as quickly as possible in the absence of the meter.
Color ring resistance for four of the most common color ring or 5 color ring, and the top three of four color ring said as the resistance, the fourth for accuracy, including DiYiErWei numerical read directly, to the third power to the power, the fourth for accuracy, five color wheel is four expressed as resistance, fifth expressed as accuracy, including DiYiErSanWei numerical read directly, to the fourth power to the power, The fifth place is precision.
27 * 10 ^ 3 = 27 k Ω plus or minus 5%
For TABLE-MOUNT RESISTORS, THE RESISTANCE VALUE IS RELATIVELY EASY TO READ AND IS USUALLY INDICATED DIRECTLY ON THE DEVICE SURFACE
For example, 5R60 means 5.6 ω, the number after R is the decimal, 151 means 15*10^1=150 ω, 103 means 10*10^3=10000= 10Kω, and so on.
In the process of selecting the parameters of the meter stick resistance device, the selection of its packaging is also very important, once the power is exceeded, it is easy to breakdown, burning phenomenon. Table stick resistance encapsulation since 0201040 2060 3080 5120 6201 0251 2, etc., with its corresponding power were 1/20 w, w 1/16, 1/10 w, w 1/8, 1/4 w, 1/2 w, 1 w.