The values or ratings of electronic components are indicated by the electronic color code that was developed in the early 1920s. It is not only seen in resistors, but also in capacitors, inductors, ...

resistance is measured in ohms (Ω) resistors control current and protect components in electronic circuits. the coloured bands on a resistor is a colour coding system used to identify resistor values ...

Usually marked onto the body of capacitors in the form of alphanumeric characters are the actual values of capacitance, voltage or tolerance. Although the capacitance value may be printed on the body ...