Reference Guide
Equation Reference 5-9
Electricity (2)
Variable
Description
∈
r
Relative permittivity
µ
r
Relative permeability
ω
Angular frequency
ω0
Resonant angular frequency
φ
Phase angle
φ
p ,
φ
s
Parallel and series phase angles
ρ
Resistivity
∆I
Current change
∆t
Time change
∆V
Voltage change
A
Wire cross-section area (Wire Resistance), or Solenoid cross-section area
(Solenoid Inductance), or Plate area (Plate Capacitor)
C, C1, C2
Capacitance
Cp,Cs
Parallel and series capacitances
d
Plate separation
E
Energy
F
Force between charges
f
Frequency
f 0
Resonant frequency
I
Current, or Total current (Current Divider)
I1
Current in R1
Imax
Maximum current
L
Inductance, or Length (Wire Resistance, Cylindrical Capacitor)
L1,L2
Inductance
Lp,Ls
Parallel and series inductances
N
Number of turns
n
Number of turns per unit length
P
Power
q
Charge
q1,q2
Point charge