"Z" . . "http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891"^^ . "http://en.wikipedia.org/wiki/Absolute_value"^^ . . . . "\\(Z = \\left | \\underline{Z} \\right |\\), where \\(\\underline{Z}\\) is impedance."^^ . "Modulus Of Impedance"@en . "http://en.wikipedia.org/wiki/Electrical_impedance"^^ . . "\"Modulus Of Impedance} is the absolute value of the quantity \\textit{impedance\". Apparent impedance is defined more generally as\n\nthe quotient of rms voltage and rms electric current; it is often denoted by \\(Z\\)."^^ .