Resistors are electronic components that oppose the flow of electricity and that resistance is measured in Ohms. For larger values, kilohms (1,000 ohms) and megohms (1,000,000 ohms) are used. These are involved in the making of almost every type of electronic device. The current through a resistor is in direct proportion to the voltage across the resistor's terminals. The ratio of the voltage
. applied across a resistor's terminals to the intensity of current through the circuit is called resistance. This relation is represented by Ohm's law: I = {V \over R}.Linear resistors are almost always found in four-color band configurations. Very occasionally, there might be a fifth color band used on resistors in super-precision equipment. Each color band represents a number and the order of the color bands will represent a number value. The first two color bands indicate a number. The third color band indicates the multiplier or in other words the number of zeros. The fourth band indicates the tolerance of the resistor +/- 20%, 10% or 5%. An explanation of this concept along with a link to details about Ohm's law is located at CSGNetwork.com, located here:http://www.csgnetwork.com/resistcolcalc.html. This site also has a Resistor Color Code Calculator. It requires Javascript in order to work and be viewed correctly. By choosing the colors of the bands on any given resistor, this calculator will interpret the Ohms of that resistor.Another resistor color chart is viewable at Elexp.com, located here: http://www.elexp.com/t_resist.htm. The standard color bands for resistors are as follows: Black, brown, red, orange, yellow, green, blue, violet, grey, white, gold and silver.Capacitors are also involved in the making of circuits and electronic equipment. There is a calculator for capacitors using a similar color-coded system available from CSGNetwork.com here: http://www.csgnetwork.com/capcccalc.html. Most capacitors have a numeric value stamped on them but some are color coded.More reference links: http://www.csgnetwork.com/resistcolcalc.html http://www.elexp.com/t_resist.htm
