Resistor Colour Coding Sheet resistors often have the following colour coding
1st colour ring 2nd colour ring 3rd colour ring 4th colour ring Resistance value:
Ohm
    Tolerance
Copyright © Iris Strassacker, 2004. All rights reserved - Warranty excluded
Please note: there are also precision multipliers with 5 colour codes, whereby 4 of them indicate the value.

When two resistors R1 and R2 are in parallel, then Rges = (R1 * R2) / (R1 + R2)

Resistors in parallel Please enter decimal separators as "."
R1 = Ohm and R2 = Ohm   Rges = Ohm
Copyright © Iris Strassacker, 2002. All rights reserved - Warranty excluded

When two resistors R1 and R2 are in series, then their resistance values are added up.
Resistors in series Please enter decimal separators as "."
R1 = Ohm and R2 = Ohm   Rges = Ohm
Copyright © Iris Strassacker, 2002. All rights reserved - Warranty excluded

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