Formula Page

Ohm's Law	Transformer Input and Output	Capacitive Reactance
Inductive Reactance	Resonant Circuit Formula	Spiral Coil
Helical Coil	Inverse Conical Coil	Secondary Coil Dimensions
Medhurst	Toroid Capacitance	Sphere Capacitance
Plate Capacitors	Leyden Jar Capacitors	AC RMS/Peak Voltage
Rotary Gap Firing	Rotary Gap Electrode Speed	Energy for L and C

E = IZ

P = IE

E = volts
I = current in amps
Z = impedance or resistance in ohms
P = power in watts

E_PI_P = E_SI_S

E_P = primary voltage
I_P = primary current in amps
E_S = secondary voltage
I_S = secondary current in amps

X_C = capacitive reactance in ohms
F = frequency in hertz
C = capacitance in farads

X_L = inductive reactance in ohms
F = frequency in hertz
L = inductance in henrys

F = frequency in hertz
L = inductance in henrys
C = capacitance in farads

L = inductance of coil in microhenrys (µH) R = average radius of the coil in inches N = number of turns W = width of the coil in inches

L = inductance of coil in microhenrys (µH) N = number of turns R = radius of coil in inches (Measure from the center of the coil to the middle of the wire.) H = height of coil in inches

L = inductance of coil in microhenrys (µH) L1 = helix factor L2 = spiral factor N = number of turns R = average radius of coil in inches H = effective height of the coil in inches W = effective width of the coil in inches X = rise angle of the coil in degrees

T = AH

L = length of wire in feet
D = outer diameter of coil form in inches
H = height of windings in inches
A = number of turns per inch
T = total number of turns
B = thickness of wire in inches

C = self capacitance in picofarads
R = radius of secondary coil in inches
L = length of secondary coil in inches

C = capacitance in picofarads
D₁ = outside diameter of toroid in inches
D₂ = diameter of cross section of toroid in inches
This equation courtesy Bert Pool.

C = capacitance in picofarads
R = radius in inches

C = capacitance in microfarads
K = dielectric constant
A = area of each plate in square inches
N = number of plates
D = distance between plates in inches (thickness of dielectric)

C = capacitance in microfarads
K = dielectric constant
D = diameter of jar in inches
H = height of jar in inches
T = thickness of jar in inches

E_RMS = 0.7071·E _P

E_RMS = RMS voltage
E_P = peak voltage

F = firings per second (hertz)
R = motor RPM rating
E = number of rotary electrodes

S = electrode speed (MPH)
R = motor RPM rating
D = diameter of electrode placement circle (inches)

Capacitance	Inductance
J = 0.5 V2 C	J = 0.5 I2 L

J = joules of energy stored
V = peak charge voltage
I = peak current
C = capacitance in farads
L = inductance in henries

Peak values of V and I are stated in order to emphasize not to use RMS values. The energy stored at any given time is of course: J(t) = 0.5 [V(t)]² C and J(t) = 0.5 [I(t)]² L.

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