#abfarad  a capacitance unit equal to one billion farads
  supertype:  #capacitance_unit__capacitanceunit  a measure of the capacity of a circuit component to store charge
  part:  #farad__F  the capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 volt between the plates
     part:  #millifarad  a unit of capacitance equal to one thousandth of a farad
        part:  #picofarad  a unit of capacitance equal to one trillionth of a farad

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