If you are not able to find the exact value of resistor that you have calculated for your circuit then you have to select the next coming value of resistor that you have calculated. The preferred values for resistors were established in 1952 but the concept of the geometric series was already introduced by army engineer renard in the 1870s.
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Usually the colored band at one end is closer to that end than is the colored band at the other end.
Valid resistor values. These standard values are also valid for other components like capacitors inductors and zener diodes. The standardization of resistor values serves several important purposes. For example if youre calculated value of resistor power rating is 0789w 789mw then you would select 1w resistor.
It is too difficult to find the exact value of resistors that you have calculated. Heres how you use the color code to figure out the nominal value of the resistor refer to the figure. Generally resistors come in 14 watt 12 watt 1 watt 2 watt 5 watt and so on.
Round the results to the proper number of significant figures three for 1 and 2 two for 5 and 10. The different values are spaced such that the top of the tolerance band of one value and the bottom of the tolerance band of the next one do not overlap. The value of a resistor is given in ohms and is often referred to as its resistance.
Generally resistors come in standard values such as e6 e12 e24 e48 e96 and e192. Standard resistor values 5 10 10 100 10k 10k 100k 10m 11 11 110 11k 11k 110k 11m 12 12 120 12k 12k 120k 12m 13 13 130 13k 13k 130k 13m. A resistor is a device that opposes the flow of electrical current.
Therefore select the next higher value of power rating. Standard resistor values are calculated using the simple formula given below. Decoding the nominal value of a resistor.
These tiny chips are marked with three 3 or four 4 digit codes which is called smd resistor codes to indicate their resistance values. As the chart at the right shows created in excel plotting the values on a logarithmic scale results in a straight line due to the exponential in the equation. Compare the ends of the resistor.
Decide which band is the first band. Calculate the resistor values given by the bands shown below. The standard resistor values are organised into a set of series of values known as the e series.
These are referred to as preferred values or e series and they are published in standard iec 600631963. Smd resistor stands for surface mount device taken out from smt surface mount technology resistor. The bigger the value of a resistor the more it opposes the current flow.
Standard resistor values in 1952 the iec international electrotechnical commission decided to define the resistance and tolerance values into a norm to ease the mass manufacturing of resistors.
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