[SATLUG] Home network
geoff at w5omr.shacknet.nu
Mon Apr 14 09:12:53 CDT 2008
Jonathan Hull wrote:
> Whoopse, I just realise I said the wrong thing about calculating
> wattage. Do Amps * Volts. Not Volts / Amps. Heh.
> So if amp-meter says .5, it is 110v * .5a = 55w.
In the world of Electronics, the symbol for Current is "I" (measured in
Amperes, or Amps.)
For Power, it's "P" (measured in Watts)
The Electromotive Force, or Voltage is depicted by an E. (later
text-books have changed this to "V" for Volts, but change is slow to
occur in the more 'seasoned' electronics people.
So, with P for Power, I for current, and E for Volts, figuring power is
as easy as PIE, or...
For a Ham Radio operator who builds his own transmitting equipment (such
as myself) this formula is used to the extent of where it's simply
second nature to know that
if there were 2000 volts on the plates of a pair of tubes, that were
drawing/consuming 500mA (half of an amp) that the wattage would be 1,000
It's just as easy if you were only using 12v on a solid state device,
that was drawing somewhere in the neighborhood of 83 amps. Pretty close
to the same power consumption.
73 = Best Regards,
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