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From: "Tom Del Rosso"
Subject: Re: can't understand this concept
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
NNTP-Posting-Date: Tue, 29 Oct 2002 23:49:10 GMT
Organization: AT&T Worldnet
Date: Tue, 29 Oct 2002 23:49:10 GMT
"David Jones" wrote in
> I have tried to learn electronics several times and given up.
The first thing you're missing is that voltages are relative. You make
repeated references to voltages as if they were absolutes. I think you
have to get past that first.
For example, you say:
"lets say the voltage on the negative side is negative 10volts and that
the positive side is (can you have + 10 volts on the
positive side? or should it be zero?)"
Anything you want can be *called* zero, but if nothing is called zero
then it's just confusing. If the relatively negative side is called
"-10" and the relatively positive side is called "+10" and there is no
zero voltage node anywhere, then one of them should be called zero and
the other should be either "-20" or "+20".
A more complex example is where you look at the gate voltage relative to
the positive or negative supply. What matters is the gate voltage
relative to the SCR cathode. The gate voltage is positive whenever it
is more positive than the cathode. This is just one example of how you
need to look at all voltages in terms of a *relevant* point of
reference. Any voltage can be measured relative to any other, but only
certain relationships are relevant, as the gate voltage is only relevant
when compared to the cathode voltage.
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