# [Fwd: Re: Maxwell]

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• Subject: [Fwd: Re: Maxwell]
• From: "Tesla list" <tesla@xxxxxxxxxx>
• Date: Wed, 09 Nov 2005 20:36:26 -0700
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`Original poster: Terry Fritz <terry-cpu4@xxxxxxxxxxxxxxxxxxxxxxx>`

In a message dated 11/6/05 7:54:37 PM Eastern Standard Time, tesla@xxxxxxxxxx writes:

```   Indeed... and that's why you can get a whole lot more than 25 A rms
through a cap from a power supply that puts out only an amp at HV
DC.  The RMS counts the *square* of the current, so, to just use a
simple example with plausible (but wrong) numbers:```

```   Assume you've got a pig type supply at 10kVA, putting out 0.5 amps at
20kV.  RMS current is 0.5A.```

```   Let's say you're firing at 100 breaks per second (i.e. every 10 ms),
and the RF pulse lasts 50 microseconds.  To a first order, then, the
current through the capacitor is going to be 10000/50 * 0.5A during
the pulse and zero at other times. That is, you'll have a series of
100 Amp pulses with a 0.5% duty cycle.```

Jim, I've been trying to figure this one out over the past few days. Please forgive my little brain, but: How did you arrive at the "10000/50 * 0.5A" for the cap pulse current?
-Phil LaBudde