

Howtoguides  Resistors

Understanding resistors
and color code table 

Resistors
The resistor is
used now more than ever on many vehicles using
data bus
communications. Understanding what they do and how they work
will make your next installation easier than ever.

Resistors
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Resistors
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A resistor is a
device which limits the flow of electricity in a circuit.
Resistors are available in many shapes, sizes and types. The type commonly used in vehicle security applications is
the fixedvalue carbon film resistor. The resistors use
colored bands to designate their value in ohms and
tolerance. An ohm is the unit of measurement which denotes

how much
resistance is applied, higher numbers being more resistance
and lower numbers being less. Tolerance is a percent value
indicating the range, plus or minus; of the stated ohm value
versus what is actually present. Resistors are also rated
by watts, which is the amount of power (voltage x amps) the
resistor can handle. If the watt rating is exceeded, the
resistor will overheat and burn up. 
Resistor value calculator

More about resistor
The value of
the resistor above is 2700 ohm, which can be abbreviated
by using the letter “k” to represent three of the digits
and the Greek letter “Omega” in place of the word “ohm”.

Abbreviated,
the value would appear as “2.7O”. The Gold 4^{th}
band denotes that this resistor will be within 5%, plus
or minus, of that value. Hence, the actual metered
value of this example will be between a low of 2565 ohms
or a high 2835 ohms.

Resistors are
nonpolarized, which means the orientation or direction
of the resistor in a circuit is not a consideration.
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