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Convert watts to Teslas?

No. You have to know the coil current and the geometry, and do the math.

John

Reply to
John Larkin
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None, inductance is lossless.

You might have luck with VAr or volts however...

Tim

-- Deep Fryer: a very philosophical monk. Website:

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Reply to
Tim Williams

I realize this depends somewhat on emitter coil efficiency ... but given an air core solenoid and sinusoidal audio frequency signal, is there anyway to approximate how many microTeslas I will get per mW?

Much thanks,

Lester

Reply to
Lester Crane

NO! Measure it; the magnetic field will vary with the signal / drive.

Reply to
Robert Baer

And ampere-turns..

Reply to
Robert Baer

I read in sci.electronics.design that Lester Crane wrote (in ) about 'Convert watts to Teslas?', on Wed, 28 Sep 2005:

No, because the field strength varies wildly with where you measure it.

In any case, you don't need ANY watts to produce the field (except for a very short time during which the field is set up). Power dissipated in the coil is just I^2R, and you can get the same field from any value of R from zero (superconducting coil) to large (thin wire, many volts required to produce the required current).

If you say what you are actually trying to do, I may well be able to help. This is an area in which I do a lot of work.

--
Regards, John Woodgate, OOO - Own Opinions Only.
If everything has been designed, a god designed evolution by natural selection.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
Reply to
John Woodgate

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