Quantities Symbol Unit Name Unit Symbol
Symbol Electromotive force E, e* Volt V
Potential difference V, v* Volt V
Current I, i* Ampere A
Magnetic flux Φ Weber Weber
Frequency f Hertz Hz
Flux linkage λ Weber-turns -
Resistance R Ohm Ω
Inductance L Henry H
Capacitance C Farad F
Impedance Z Ohm Ω
Reactance X Ohm Ω
Power,dc,or active P Watt W
Power, reactive Q Volt-ampere VAr, var
Power, total or S Volt-ampere VA
apparent
Power factor angle φ - °, deg.
Angular velocity ω Radiants per rads-1
second
Rotational velocity n Revolutions s-1 ,rev s-1
per second
Revolutions min-1, rpm
per minute
Efficiency η -
Number of pairs p -
of poles