Related Resources: Engineering Conversions Equivalent

Electric and Magnetic Quantities Units and Conversions

Engineering Conversions and Equivalents

Electric and Magnetic Quantities Units and Conversions

Where:

Length = L
Mass = M
Time = T
Current = Q/T
Charge = Q

Electric and Magnetic Quantities

Electric and Magnetic Quantities

Conversion of mksq Units to Gaussian Units

Gaussian Units

*c = vel. of light (free space) in cm/sec ≈ 3 × 1010 Use of table:
1 coulomb = 10-1 (3 × 1010) statcoulomb = 3 × 109 statcoulomb

QUANTITY
SYMBOL
SI UNIT
SI
EQUATION
CGS
UNIT
CGS
EQUATION
CONVERSION
FACTOR
Magnetic
induction
B
tesla (T)
B=µ o (H+M)
gauss (G)
B = H+4πM
1 T = 10 4 G
Magnetic
field strength
H
ampere/ meter
(A/m)
H = N×I/lc
( lc - magnetic
path, m)
oersted (Oe)
H = 0.4πN×I/lc
(lc - magnetic
path, cm)
1 A/m =
4π×10 -3 Oe
Magnetic flux
Φ
weber (Wb)
Φ = B×Ac
(Ac - area, m 2 )
maxwell (M)
Φ = B×Ac
(Ac- area, cm 2 )
1 Wb = 10 8 M
Magnetization
M
ampere/ meter (A/m)
M=m/V
(m- total magnetic moment,
V- volume, m 3 )
emu/cm 3
M=m/V
(m- total magnetic moment,
V- volume, cm 3 )
1 A/m = 10 -3
emu / cm 3
Magnetic
permeability
of vacuum
µ o
newton/ ampere 2
µ o = 4π×10 -7
1
-
4π×10 -7
Inductance
L
henry
L=μ o μN 2 Ac/lc
(Ac- area, m 2 ,
lc - magnetic path, m)
henry
L=0.4πμN 2 Ac/lc×10 -8
(Ac-area, cm 2 ,
lc - magnetic path, cm)
1
Emf (voltage)
V
volt
V=-N×dΦ/dt
volt
V= - 10 -8 N×dΦ/dt
1
Note: in the above equations: N- turns, I - current (in amps)
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