[geocentrism] Re: modern edu

• From: "Martin G. Selbrede" <mselbrede@xxxxxxxxxxxxx>
• To: geocentrism@xxxxxxxxxxxxx
• Date: Wed, 26 Sep 2007 07:52:09 -0500

No, Phil, they ARE using farads. If you use a calculator, you'll see that the denominator should be 0.0314, which is 6.28 x 100 x 0.00005 farads. I get the same answer they get, 31.8 ohms. They ARE incorporating the correct adjustment for the "micro" part of microfarads. You must be getting turned around somewhere in your calculating.

```
Martin

On Sep 26, 2007, at 12:04 AM, philip madsen wrote:

```
Please tell me I aint nuts. I don't use formula often, so though I instinctively say reactance is I forget the application for microfarads when the unit is Farad in this equation.
```
```
Yet just look how this formula is applied in not one but two different websites.. . Note they correctly state for this formula, C is capacitance in farads yet substitute microfarads into the equation. Isn't their answer wrong. shouldn't there be a 10^6 on the top line.
```

```
Or am I just too old and missing something. Can a math man please check me out? I compute the answer should be 31,250 ohms. Philip.
```
Quote,

```
Now you can understand why it is said that the XC varies inversely with the product of the frequency and capacitance. The formula is:
```

```
Where: XC is capacitive reactance in ohms, f is frequency in Hertz, C is capacitance in farads, p is 6.28 (2 X 3.1416) The following example problem illustrates the computation of X C.
```

```
```
--------
Martin G. Selbrede
Chief Scientist
Uni-Pixel Displays, Inc.
8708 Technology Forest Place, Suite 100
The Woodlands, TX 77381
```
281-825-4500 main line (281) 825-4507 direct line (281) 825-4599 fax (512) 422-4919 cell
```mselbrede@xxxxxxxxxxxxx / martin.selbrede@xxxxxxxxxxxx

```