Circuits, Formulas and Tables Electrical Engineering  Basic vocational knowledge (Institut für Berufliche Entwicklung, 201 p.) 
11. Basic symbols and formulas of electrical engineering 

The following is valid:
I 
= current intensity in A  
E 
= empressed voltage in V  
U 
= voltage, terminal voltage in V  
R 
= resistance in w  
L 
= inductivity in H 
_{}  
w 
= gyrofrequency in _{} or Hz  
f 
= frequency in _{} or Hz 

C 
= capacity in F 
_{}  
r 
= resistivity in _{}  
c 
= unit conductance in _{} 

A 
= conductor crosssection in mm^{2}  
d 
= diameter in mm  
P 
= power in W (active power)  
Q 
= reactive power in Var  
S 
= apparent power in VA  
W 
= work in Wh or Ws  
cos j 
= power factor  
h 
= efficiency  

= flux in A  
B 
= magnetic induction in T or _{}or_{}  
H 
= magnetic field strength in _{}  
E 
= electric field strength in _{}  
f 
= magnetic flux in Wb or Vs  
F 
= force in N 
_{}  
v 
= velocity in _{}  
w 
= number of turns  
t 
= time in s or h  
J K 
= initial temperature  
J W 
= final temperature  
R_{K} 
= resistance at initial temperature  
R_{W} 
= resistance at final temperature  
µ 
= temperature coefficient in _{}  
p 
= 3,14 
influence of the temperature on the resistance of the conductor _{}