unknown formula

[foTONICS]

Hey everyone. I have a mid-term next week and I was going through my notes and I came across this formula:

k= M/√(L_1*L_2 )

I believe it has something to do with transformer coupling. L1 and L2 being the first and second transformer. I know that K is a constant, but i am having trouble remembering what the M stands for.

any help is appreciated.

 

[davelectronic]

My maths is not good, could it be mutual, or mass. Other than that not sure.
Dave.

 

[foTONICS]

I found it, M is the mutual inductance between the two transformers

 

[duke37]

Except that there are not two transformers, only one. There are two windings.

 

[foTONICS]

sorry, meant the coils of the two tuned circuits

 

[KJ6EAD]

It's a version of the mutual inductance formula arranged to solve for the coupling coefficient. M is the mutual inductance; k is the coupling coefficient (0-1).

 

[Will D]

You are right fo Tonics M is Mutual induction in the formula.