Surprisingly the letters for resistance, reactance, and impedance are the same in English and German. i think voltage (German U) and current (German I) are different.
The symbol I is used for current in English too. (C is capacitance).
Voltage is normally V or E, but with harmonized standards coming into effect many "official" sources such as the I.E.E. are now using U for voltage as well.
Isn't "Spannung" the German for voltage?
