# Series Resistance Inductor

Discussion in 'General Electronics Chat' started by VVS, Aug 13, 2014.

1. ### VVS Thread Starter Active Member

Jul 22, 2007
66
0
Hey,

How do you calculate the equivalent series resistance of an inductor?
I know that it is just a wire and that you could calculate the resistance using the crosssectional area, length and resistivity of the wire. But shouldn't the fact that we are turning the wire have an effect on the formula?

Thanks
VVS

Jul 18, 2013
10,503
2,366
Coiling the wire has no effect on the resistance of the wire.
Max.

3. ### alfacliff Well-Known Member

Dec 13, 2013
2,449
428
just measure the resistance with an ohmmeter. resistance in an inductor has an effect on the Q or quality factor of the coil, and losses.

4. ### THE_RB AAC Fanatic!

Feb 11, 2008
5,435
1,305
For SMPS use I run DC through it at roughly the same amount of current it will get when in use.

Then after it warms up measure the dropped volts, and get the effective operating R from R=E/I.