Page 63 - Apprentice Manual_Neat

EGSA Formula Sheet

r = /o  = permeability of a material
r = Relative Permittivity (dielectric (Henrys/m)
Constant K) 
 = Absolute Permittivity  r =  / o
o = Absolute Perm. in vacuum (8.85 x  r = Relative Perm.
2
2
-12
10 C /Nm )  = lines of flux produced with material
as a core
Dielectric Constants  o = lines flux w/air as core (4 x 10 )
-7
Vacuum 1.0
Air 1.0006
Mica 5.5 F = N*I
Paper 5.0 F = mmf (Amp*turns)
Ceramic 2000 F = *R
C = Q/V F = l
C = Capacitance
Q = Charge in Coulombs
V = Volts Air Gap
 Bg = g/Ag
 = RC Hg = Bg/o
R = Resistor Hg = (7.97 x 10 5) * Bg
C = Capacitor

XC = 1/(2fC) B = NI/l
f = Frequency
B = Flux Density (Teslas)
C = (o * r A)/d NI = Amp*turns
2
A = Area (m ) l = Length (m)
d = distance (m)  = Permeability of material
-7
2
W = (CVc )/2 4 x 10 = Permeability of Air
W = energy stored in Joules
C = Capacitance in Farads  = L/R
Vc = Voltage across capacitor
e = N(/t)
Capacitors in Series
CT = 1/((1/C1) + (1/C2)+ (1/C3)+… e = Induced Voltage
(1/Cn)) N = Number of turns
Capacitors in Parallel (/t) = Change in flux/change in time
CT = (C1 + C2 + C3+ … Cn) (webers/sec)

B = /A XL = 2fL
B = Flux Density (Teslas) L = Inductor in Henrys
 = Total Field Flux (Webers)
2
A = Cross-sectional Area (m )
L = eL/(it)
F = I x N
F = mmf (amp*turns) L = Inductance of circuit (Henrys)
I = Current through the coil eL = Induced Voltage (Volts)
N = Number of turns of a coil (it) = Instantaneous rate of change
of current (amps/sec).
R = F /  M = k√(L1L2)
R = Reluctance (amp*turns/Weber)
F = mmf M = Mutual Inductance (Henrys)
 = Magnetic Flux (Webers) k = Coefficient of Coupling (Constant)
L1 = Inductance of first coil (Henrys)
H = F /l L2 = Inductance of second coil
(Henrys)
H = Magnetic Field Strength
(Amp*Turns/Meter)
F = mmf (amp*turns) M = (Nss)/Ip
Ns = Number of turns on secondary
l = Length (m)
s = Secondary Flux (Webers)
Ip = Primary current (Amps)
 = B/H
Page 55 - EGSA Apprentice Certification Program Study Guide