Goto:   Inductance
Output
Format        Notes

Definition:

Equation

Parameters

Diagram

Calculate
Inductance:
top

Parameter

Value

Units

Special Values

Inputs:

R
(coil radius)

inchesmeterscentimetersmillimetersmicrometersnanometersfeetmilsyardsmileskilometerslightyearsangstrom (ũastronomical unit (AU)fermi
(fm)micron (um)nautical mile
(nmi)parsec (pc)statute
mile (mi)yard (yd)____________________

H (coil height)

inchesmeterscentimetersmillimetersmicrometersnanometersfeetmilsyardsmileskilometerslightyearsangstrom (ũastronomical unit (AU)fermi
(fm)micron (um)nautical mile
(nmi)parsec (pc)statute
mile (mi)yard (yd)____________________

N (#
of turns)

Outputs:

L (inductance)

nH,
nanohenrysH, HenrysmH,
millihenrysuH, microhenryspH,
picohenrys____________________

l (wire length)

inchesmeterscentimetersmillimetersmicrometersnanometersfeetmilsyardsmileskilometerslightyearsangstrom (ũastronomical unit (AU)fermi
(fm)micron (um)nautical mile
(nmi)parsec (pc)statute
mile (mi)yard (yd)____________________

P
(coil pitch)

inchesmeterscentimetersmillimetersmicrometersnanometersfeetmilsyardsmileskilometerslightyearsangstrom (ũastronomical unit (AU)fermi
(fm)micron (um)nautical mile
(nmi)parsec (pc)statute
mile (mi)yard (yd)____________________

Output
Format:
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Select
Format:

Scientific

Engineering

Fixed

Notes:
top

Inductance is an empirical approximation
AFAIK

Note that L doesn't depend on wire diameter!

Assumes a coil with only a few turns

Bruce Weber has compared this formula to one in Lorrain and Corson
(E&M textbook) and found agreement when coil length > coil
radius.

Sources:

Inductance from
Amateur Radio Handbook

My own formulae
for length!

Copyright ?2006  Raymond J. Allen