항목

기호표시

산출공식

SI 위

SI기호

CGS단위

배수(CGS/SI)

전류

I, i

I=E/R, I=E/Z, I=Q/t

Ampere

A

Abampere

10-1

style="font-family:굴림;">전하량

Q, q

Q=I×t, Q=C×E

Coulomb

C

Abcoulomb

10-1

style="font-family:굴림;">전압

E, e

E=I×R, E=W/Q

Volt

V

Abvolt

108

style="font-family:굴림;">저항

R, r

R=E/I, R=(ρ×l)/A

Ohm

Ω

Abohm

109

style="font-family:굴림;">저항률

ρ

p=(R×A)/l

Ohm-meter

Ω·m

Abohm-cm

1011

Conductance

G, g

G=(γ×A)/l, G=A/(ρ×l)

Siemens

S

Abmho

10-9

style="font-family:굴림;">도전율

G

G=R/Z2

Siemens

S

Abmho

10-9

Capacitance

γ

γ=l/ρ, γ=l/(R×A)

Siemens-meter

S/m

Abmho/cm

10-11

C

C=Q/E

Farad

F

Abrarad

10-9

style="font-family:굴림;">유전율

ε

Farad/meter

F/m

Stat farad/cm

8.85×10-12

style="font-family:굴림;">상대유전율

εr

εr=ε/εo

Numerical

Numerical

1

style="font-family:굴림;">자기유도

L

L=-N×(d쬳/dt)

Henry

H

Abhenry

109

style="font-family:굴림;">상호유도

M

M=K×(L1×L2)1/2

Henry

H

Abhenry

109

Energy

J

J=e×I×t

Joule

J

Erg

107

kWh

kWh=kW/3600, 3.6M×J

Kilowatthour

kWh

36×1012

style="font-family:굴림;">유효전력

W

W=J/t, W=E×I×cosθ

Watt

W

Abwatt

107

style="font-family:굴림;">무효전력

jQ

jQ=E×I×sinθ

Var

var

Abvar

107

style="font-family:굴림;">피상전력

VA

VA=E×I

Volt-ampere

VA

style="font-family:굴림;">역률

PF, pf

PF=W/(V×A), PF=W/(W+jQ)

Ohm

1

유도 Reactance

XL

XL=2π×f×L

Ohm

Ω

Abohm

109

용량 Reactance

XC

XC=1/(2π×f×C)

Ohm

Ω

Abohm

109

Impedance

Z

Z=E/I, Z=R+j×(XL-XC)

Siemens

Ω

Abohm

109

Susceptance

B

B=X/Z2

Siemens

S

Abohm

10-9

Adimittance

Y

Y=I/E, Y=G+jB

Hertz

S

Abohm

10-9

주파수

f

f=1/T

Second

Hz

Cps, Hz

1

주기

T

T=1/f

Second

s

Second

1

시간상수

T

T=L/R, T=R×C

Radians/second

s

Second

1

각속도

ω

ω=2π×f

rad/s

Radians/second

1