The intent of this set of web pages is to provide a set of technical data and equations commonly used in engineering associated with high voltage, pulsed power, and power conditioning hardware.

Although every attempt has been made to correctly list these data and equations, some errors may still exist.  If you believe that an error exists or if you have other suggestions, then please send an e-mail message including your name and suggestion to

Web Page Description
Attenuator Circuits

Circuit and equations for T-pad, matched impedance, signal attenuators.

Bare Copper Wire

Diameter, cross-sectional area, weight per 1000 feet, and resistance per 1000 feet for solid bare copper wire from 0000 AWG to 56 AWG.

Brooks Coil

Equations related to calculating the inductance of a Brooks coil (the geometry typically associated with the highest inductance for a given length of wire).


Capacitance equations for common geometries (parallel plate and coaxial).

Capacitor Lifetime

Equations related to estimating capacitor lifetimes.

Coaxial Cable

Construction data on 35 commonly used coaxial cables including dielectric material, center conductor and shield makeup, outside diameter, nominal impedance, capacitance and inductance per foot, and RMS voltage rating.


Equations related to pulsed power diagnostics (including current or b-dot loops, Rogowski coils, current transformers).

Dielectric Materials

Data associated with common dielectric materials.

Field Enhancement

Equations for the maximum electric field associated with eleven different common geometries.

Fuse Equations

Data and equations associated with conductor fusing (Preece's Law).


Impedance equations for common geometries (parallel plate and coaxial).


Inductance equations for common geometries (parallel plate, coaxial, and wire loop).

Liquid Resistors

Data associated with liquid resistor solutions (copper sulfate, ammonium chloride, sodium chloride, and sodium thiosulfate).

Magnetic Materials

Parameters associated with common magnetic materials.

Magnetic Switching

Equations related to magnetic switch design.

Marx Generators

Design details associated with Marx Generators.

Mechanical Screws

Mechanical screw thread data for both coarse and fine thread screws from size 0 to 1 inch including threads per inch, major and minor diameters, and lead angle.

Physical Constants

22 Fundamental physics constants.

Pulse Forming Networks

Equations related to Pulse Forming Network (PFN) design.

RC Charging

Equations related to RC charging (or discharging).


A list of valuable references and texts related to high voltage, pulsed power, and  power conditioning.


Resistivity (in micro-ohm-cm and in ohms per million feet) and the temperature coefficient of resistance for 46 pure metals and 28 metal alloys.

Resistor Color Code

Standard resistor color code.

Resistor Standard Values

Standard resistor values for 0.1%, 0.25%, 0.5%, 1%, 2%, 5%, and 10% resistors.

Resonant Charging

Equations related to resonant charging (CLC charging from one capacitor to another).

RLC Circuit

Equations related to a series RLC circuit discharge.

RMS and Average Values

RMS and average values for 8 common waveforms.

Rogowski Profile Electrodes

Rogowski and other uniform electric field electrodes.


Equations to calculate the inductance of a solenoid.

Skin Depth

Equations to calculate the high frequency resistance of conductors due to skin effect.

Splitter/Adder Circuits

Circuit and equations for 3-5 port, matched impedance, signal splitter/adders.

Surfaces and Volumes

Equations to calculate the surface area and volume of 7 common geometries.


Equations to calculate the inductance of a toroid.

Transmission Line Standard transmission line equations.
Water Cooling Equations to calculate the temperature rise of cooling water for a given flow rate and power dissipation.

Send consulting inquiries, comments, and suggestions to


Ness Engineering, Inc.
P.O. Box 261501
San Diego, CA 92196
(858) 566-2372
(858) 240-2299 FAX

Richard M. Ness and Ness Engineering, Inc.
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