This section is here for reference purposes only and will not be examined. There is an established series of values of resistors, only values with certain digits are manufactured. Tolerance of the resistance varies - resistors are mass manufactured, so some variations are hard to avoid.
Resistors have a wattage rating.
The higher this rating the more heat they can dissipate. Most standard commercial resistors have stripes painted on them, these stripes indicate their value of resistance and tolerance. Wire wound resistors have their value written on them. The Resistor Colour Code allows to read the values of resistors. The procedure is as follows.