How is a resistor calculated?
From Wikipedia:
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
Yes like this.
This is the thing. The rings indicates how much ohm with which tolerance a resistor has. There are resistors with 5 and 4 rings.
It's not that difficult:
It depends. Not all colors are possible at all locations. for example black never appears at the 1st band. But for the calculation it's true.
It will tell you if a color is at a position it can't be