Q: Is a farad defined as the capacitance across which? ¶
A: Yes, when charged with one coulomb, there is a potential difference of one volt.
Q: Is a farad rarely used in practice? ¶
A: Yes, for example, is instead written as 4700 µF), while the nanofarad is uncommon in North America).
Q: Was a farad officially used for the unit of electrical capacitance? ¶
Q: Is a farad an impractically large unit of capacitance? ¶
Q: Is a farad sometimes colloquially pronounced as "puff" or "pic", as in "a ten-puff capacitor"? ¶
A: Yes, Similarly, "mic" is sometimes used informally to signify microfarads.