The electronic color code is used to indicate the values or
ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others. A separate code, the 25 pair color code, is used to identify wires in some telecommunications cables.
This video I will show you
calculate color code of this resistor.
Resistor Color bands were
used because they were easily and cheaply printed on tiny components. First I
show the color chart of the resistor and calculate the 4 color band resistor.
band A is the first significant figure of component
value (left side).
band B is the second significant figure (some
precision resistors have a third significant figure, and thus five bands).
band C is the decimal multiplier.
band D if present, indicates tolerance of value in
percent (no band means 20%).
For example, a resistor with bands of yellow, violet, red,
and gold has first digit 4
(yellow in table below), second digit 7 (violet), and followed by 2 (red), 100:
4,700 ohms. Gold signifies that the tolerance is ±5%, so the real
resistance could lie anywhere between 4,465 and 4,935 ohms.
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