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Re: mathematics
From: Robert W. Stephens[SMTP:rwstephens-at-headwaters-dot-com]
Reply To: rwstephens-at-headwaters-dot-com
Sent: Monday, September 08, 1997 5:46 PM
To: Tesla List
Subject: Re: mathematics
>
> From: Kevin[SMTP:wawa-at-spectra-dot-net]
> Reply To: wawa-at-spectra-dot-net
> Sent: Sunday, September 07, 1997 8:13 PM
> To: Tesla List
> Subject: Re: mathematics
>
> Tesla List wrote:
> >
> > From: DamDeName-at-aol-dot-com[SMTP:DamDeName-at-aol-dot-com]
> > Sent: Sunday, September 07, 1997 3:10 AM
> > To: tesla-at-pupman-dot-com
> > Subject: Re: mathematics
> >
> > Hi Kevin,
> >
> > One handy-dandy formula for single layer coils is :
> >
> > L= (N x A)^2 / 9A + 10B
> >
> > where: L is inductance in microheneries
> > N is the number of turns
> > A is the mean radius of the coil in inches
> > B is the length of the coil in inches
> >
> > The above formula ---- re-arranged as follows --- will determine the
> > number of turns for a given inductance--------------
> >
> > N = the square root of L(9A + 10B )/A
> >
> > According to the scuttlebutt the above are accurate to 1%
> >
> >
> >
> > Have fun ,
> > Sandy
> >
>
> When people are giving the inductance of their chokes as 6mH, does the
> 'm' mean mili or micro? I assumed it stands for mili, but I don't think
> you can reproduce the symbol for micro with the keyboard.
>
> thanks
> Kevin
>
Kevin, All,
For microhenry use the letter u in lower case as in uH.
rwstephens