# Why does a ceramic capacitor have no polarity

## Capacitors

### Coding of capacities

Several values ​​are usually given for capacitors:

• the polarity of polarized capacitors
• the maximum permissible operating voltage

Depending on the size, the values ​​of the capacitors are given in normal or coded form.

The capacitance of capacitors is in Picofarad coded.

• The printed value consists of 3 digits.
• The first two are the numerical value.
• The last digit determines how many zeros must be appended.

### Meaning of the last digit

The last digit determines by which value the numerical value of the first two digits must be multiplied.

 Last digit multiplier or 0 * 1pF 1 * 10pF 2 * 100pF 0.1nF 3 * 1nF 4 * 10nF 5 * 100nF 0.1µF 6 * 1µF 7 * 10µF 8 * 100µF

### example

 imprint Numerical value Zeros value value 475 47 5 47 * 100nF 4700nF = 4.7µF 106 10 6 10 * 1µF 10µF 104 10 4 10 * 10nF 100nF

### tension

The maximum permissible voltage is specified in volts. Often there is a lack of unity V..

### polarity

The polarity is usually only given for one connection.

• - for the minus connection
• sometimes behind the voltage value