There are many colours for resistor rings but the reason that we have them is to help the resistor reduce the electrical current that is passing through.
Resistor is a two terminal electronic component that produces voltage across its terminal. It is usually rounded by 5 colors. Simple illustration below. The "I" represent colors. . . terminal ======[ I I I I I]====== terminal
Three red color bands indicate a resistor value of 2,200 ohms (2.2 kohms)
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3 to 6 depending on precision and temperature characteristics.
The colored bands on a resistor represent the resistor value and tolerance. The first two bands indicate the significant digits of the resistance value, the third band represents the multiplier, and the fourth band (if present) indicates the tolerance of the resistor. By decoding these colors, you can determine the resistance value of the resistor.
Resistors have standard colors for identification of the resistance value. In order, the colors are: black, brown, red, orange, yellow, green, blue, violet, gray, and white. Reading resistors is a very simple procedure if you use the chart and formula below. Hold the resistor with the gold or silver band to the right and read the resistor from the left to the right. http://www.westfloridacomponents.com/reschart.html
The wires have an orange plastic shielding. The wires are white and black. If you know the value of the resistor you can cut the wires going to the lock cylinder and solder in a resistor of the correct value.
This varies depending on the color. Try driving them with a current source instead. About 5mA to 50mA should work on any LED. Using a voltage source will blow some colors, and not light other colors at all. Of course a current source is likely to be more expensive than a series resistor.
yes, a variable resistor
Otis F. Boykin invented the wire precision resistor and the electrical resistor.
A non-ohmic resistor doesn't have a constant resistance. A ohmic resistor has a constant resistance.
A cement resistor is typically used as a power resistor (a resistor whose power rating is greater than 1 W).