>> Can anybody with a good inductance meter, please measure a 10 watt
>> wirewound resistor of 820oms and tell me the inductance. I am getting
>> wildly different figures from various sources.
>>
>> Thanks all.
> *if* it's a straight coil of wire with an air core, then Wheelers formula
> gives a reasonable result for inductance.
>
> L (uH) = (r*r + n*n) / (9r + 10l)
>
> Dimensions all in inches.
> r = coil radius
> n = no of turns
> l = coil cylinder length
>
>
Sorry, correct equation:
L (uH) = (r*r*n*n) / (9r + 10l)