What is the labeling nomenclature for capacitors and how is it used to identify and select capacitors?

Answer 1

Capacitors are marked with the capacitance and the maximum working voltage. The action of a capacitor is store charge short-term and a capacitor is commonly used as a reservoir of charge in a rectifier circuit to smooth the dc output voltage. Other uses in electronic circuits are as a dc-blocker which passes an ac signal while not passing the dc bias, or as a decoupling capacitor in dc circuits to remove any ac signals present while preserving the dc voltage, or in timing circuits because the time-constant of a resistor and a capacitor connected together is CR, or in filters and tuned circuits. Sometimes a variable capacitor is used, connected to a control knob for tuning a radio.

In each of the above applications there are accurate methods to decide exactly how much capacitance is required.