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

Circuits, Formulas and Tables Electrical Engineering - Basic vocational knowledge (Institut für Berufliche Entwicklung, 201 p.)

11. Basic symbols and formulas of electrical engineering

		*(introduction...)*
		11.1. General direct current engineering
		11.2. Magnetic field
		11.3. Law of induction
		11.4. Electric field
		11.5. Alternating current engineering
		11.6. Calculation of power

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	= gyro-frequency in or Hz
f	= frequency in or Hz
C	= capacity in F
r	= resistivity in
c	= unit conductance in
A	= conductor cross-section in mm²
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