[geocentrism] Re: modern edu

  • From: Neville Jones <njones@xxxxxxxxx>
  • To: geocentrism@xxxxxxxxxxxxx
  • Date: Wed, 26 Sep 2007 03:13:26 -0800

They have used 50 uF in the denominator, which is 5x10^-5 F.
Hence, without a calculator, 6.28 x 100 (= 628) x 5 (= 3,140) x 10^-5 = 0.0314

-----Original Message-----
From: pma15027@xxxxxxxxxxxxxx
Sent: Wed, 26 Sep 2007 15:04:18 +1000
To: geocentrism@xxxxxxxxxxxxx
Subject: [geocentrism] modern edu

Please tell me I aint nuts. I don't use formula often, so though I instinctively say reactance is 0203.GIF (218 bytes)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.

50 micro Farads = 50 x 10 to the -6th. Farads.

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.


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

0203.GIF (218 bytes)

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.

0204.GIF (1402 bytes)

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