Like the title says.

Is 1/Rges = 1/R1 + 1/R2.... for magnetic resistances true aswell?

E.g. can we say that Rpar = R1*R2/(R1+R2) with magnetic resistances in parallel?

  • \$\begingroup\$ This is a basic theory question appropriate for Wikipedia or any related book or resource. Not SE. \$\endgroup\$
    – Eugene Sh.
    Jan 19, 2017 at 16:07
  • \$\begingroup\$ On Wikipedia it says that magnetic circuits follow the rules of electric circuits and resistances in series are calculated the same way. But nothing about resistances in parallel. I already checked wikipedia. Give me a quick reference to a source or something else and we can close this. \$\endgroup\$ Jan 19, 2017 at 16:11
  • 1
    \$\begingroup\$ Lets see, if you google this and go a few links down to this \$\endgroup\$
    – Voltage Spike
    Jan 19, 2017 at 16:57

1 Answer 1


Yes, reluctances add the same way as resistors in parallel. That's why the centre post of an E-I transformer lamination is usually twice the area of the sides.

enter image description here

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    \$\begingroup\$ Question originated exactly from such a thing :) \$\endgroup\$ Jan 19, 2017 at 16:33

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