Maths question.

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Dr Jekyll

Original Poster:

23,820 posts

262 months

Tuesday 28th February 2023
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I have two equations. A = 2Pi * F * L, and B = 1/(2Pi * F * C).

What I’d like is one equation that given values of C and L, tells me what value of F makes A = B but i can't see how to create it.

These are both equations used in electronics, particularly radio. The first one tells you the ‘reactance’ (effectively the resistance) of an inductor at a given frequency. F being the frequency and L being the value of the inductor. The second gives the reactance of a capacitor at a given frequency, C being the value of the capacitor.

The idea is that if both components are in a circuit they will either block or pass a specific frequency depending on how they are wired up. That frequency being the one where reactance is the same for both components. That’s why I’d like one equation that I can plug L and C into and read the value of F where A = B, without worrying about what A and B are except for being the same.

(Taking a few liberties with terminology here to avoid getting bogged down with matters irrelevant to the algebra)


Dr Jekyll

Original Poster:

23,820 posts

262 months

Tuesday 28th February 2023
quotequote all
Thanks everyone.