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From: "petrus bitbyter"
Subject: Re: Higher loads on triac light dimmer ???
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
Date: Wed, 18 Sep 2002 13:20:44 GMT
NNTP-Posting-Date: Wed, 18 Sep 2002 15:20:44 MET DST
Organization: chello broadband
"scada" schreef in bericht
> Why not put a rectifier diode in series with the load! The coffee pot
> be all resistive, unless it has an electronic timer or such in it!
Some simple calculations using Ohm's law show that its a wrong assumption.
A resistive load for 110V and 1300W will draw a current of 1300/110=11.8A.
So its resistance is 110/11.8=9.32Ohm.
Double the voltage will double the current 220/9.32=23.6A.
So the dissipated power will be 220*23.6=5192W (or about 4*1300=5200).
When you use a diode, voltage, current and power will remain unchanged for
half a period and be zero for the other half. So effectively the dissipated
power will still be double the rated 1300W.
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