# rel

A unit of magentic reluctance proposed by Vladimir Karapetoff in 1911, but not adopted.

## source

The definition of the unit of reluctance follows directly from
eq. (1). A magnetic circuit has a unit reluctance when a magnetomotive
force of one ampere-turn produces in it a flux of one
maxwell.² No name has been given to this unit so far. The author
ventures to suggest the name *rel*, and he uses it provisionally in this
book. Granting that reluctance is a useful quantity in magnetic
calculations, one must admit that it should be measured in some
units of its own; unless one chooses to use the cumbersome notation
“ampere-turns per maxwell.” The name rel is simply the
beginning of the word reluctance. Thus, a magnetic circuit has
a reluctance of one rel when one ampere-turn produces one
maxwell of flux in it. The unit rel is analogous to the ohm in the
electric circuit, and to the daraf in the electrostatic circuit.

2 See Appendix I at the end of the book.

V. Karapetoff.

*The Magnetic Circuit.*

New York: McGraw-Hill Book Company, 1911.

Page 8.

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Last revised: 26 April 2017.