Electrical Formulas
電子公式。I=Q/t
I:Current(A)
Q:Charge(c)
t:Time(sec)
V=IxR
I=Current(A)
R:Resistance(ohm)
R=pL/A
R:Resistance(ohm)
p:Resistivity(ohm-m)
L:Length(m)
A:Cross sectional area(m2)
DC
P=VxI
or
P=V2xR
or
P=I2xR
P:Power(W)
V:Voltage(V)
I:Current(A)
R:Resistance
AC
P:Power(W)
V:Voltage(V)
I:Current(A)
E=(P*t)/1000
E:Power(W)
t:time(h/day)
C=Q/V
C:Capacitance(F)
Q:Charge(C)
V:Voltage
Xc=1/(2丌fc)
Xc:Reactance(ohm)
C:Capacitance(F)
f:Frequency(Hz)
XL=2丌fL
XL:Reactance(ohm)
L:Inductance(Hz)
f:Frequency(Hz)
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