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BASIC EQUATIONS CHAPTER 16 ELECTRIC POTENTIAL
EQUATION
VARIABLES
V
PE
q
PE
q
V
SI UNITS
net electric potential in space at the location of
charge q
electric potential energy of charge q
an electric charge in an electric field (q is not the
source of the field)
V
PE
q
J/C or Volts, V
J
C
electric potential energy of charge q
an electric charge in an electric field
net electric potential in space at the location of
charge q
PE
q
V
J
C
V
DPE change in electric potential energy of charge q
q
an electric charge in an electric field
DV change in net electric potential between two
points in an electric field
DPE J
q
C
DV V
V
V
k
Q
r
k
Q
r
electric potential at a point in space from a point
charge or spherical charge distribution
electrostatic constant = 9.0×109 Nm2/C2
point charge or spherical charge
distance point is from center of Q
V
Nm2/C2
C
m
VP
net electric potential at point P
VP,qi electric potential at P due to charge qi
VP
V
VP,qi V
DV
change in electric potential in a uniform electric
field
the magnitude of a uniform electric field
displacement along an x-axis oriented in the
direction of the electric field
DV
E
Dx
V
N/C or V/m
m
change in electric potential in an electric field
produced by a point or spherical charge
electrostatic constant = 9.0×109 Nm2/C2
point or spherical charge producing the field
final distance from center of Q
initial distance from center of Q
DV
k
Q
rB
rA
V
Nm2/C2
C
m
m
E
Dx
DV
k
Q
rB
rA
DKE change in kinetic energy of charge q while
moving in an electric field
q
moving electric charge
DV change in electric potential as the charge moves
DKE J
q
C
DV V
C
Q
V
C
Q
V
capacitance of two conductors
charge separated on conductors
electric potential difference between conductors
C/V or Farad, F
C
V
EQUATION
VARIABLES
SI UNITS
C
0o
A
d
capacitance of a parallel plate capacitor
permittivity of free space = 8.85×10-12 C2/Nm2
inside area of one plate
distance between plates
C
0o
A
d
F
C2/Nm2
m2
m
U
C
V
Q
stored energy in a capacitor (also denoted as PE)
capacitance
voltage across capacitor
charge separated in capacitor
U
C
V
Q
J
F
V
C
Ceq
equivalent capacitance of a group of capacitors
connected in parallel
capacitance of individual capacitor in original
parallel group
charge stored in equivalent capacitor
charge stored in individual capacitor in original
parallel group
Ceq
Ci
Qeq
Qi
F
F
C
C
equivalent capacitance of a group of capacitors
connected in series
capacitance of individual capacitor in original
series group
voltage across equivalent capacitor
voltage across individual capacitor in original
series group
Ceq
Ci
Veq
Vi
F
F
V
V
capacitance with a dielectric material
dielectric constant of dielectric material
capacitance without dielectric material
C
k
Co
F
none
F
Ci
Qeq
Qi
Ceq
Ci
Veq
Vi
C
k
Co