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From: firstname.lastname@example.org (Robin)
Subject: Re: how to tell when forward bias?
Date: 30 Oct 2002 06:02:25 -0800
NNTP-Posting-Date: 30 Oct 2002 14:02:25 GMT
"David Jones" wrote in message news:...
> lets say theres a circuit like the following
> ----------10k resistor-----------(gate to SCR) -------800ohm
> | |
> anode-(SCR)-cathode -------------------------(-)
> lets say there is a -9 voltage on the right. wouldn't that make the SCR
> gate negative? I've been told it makes it positive. and why would it be
> positive? the gate is connected to both the positive and negative leads.
> one person told me that the gate needs to be positive relative to the
> cathode. well wouldn't that be true even if you disconnected the positive
> lead from the gate of the SCR because the 800ohm resisitor would make the
> voltage to the gate drop below the voltage of the cathode. That means it
> would be positive right? I am totally and utterly confused here. I can't
> understand even the simplest circuits well because of this junk. could
> someone tell me a fool proof way to think of circuits like this, including
> transistors and such, so that I can't possibly get confused?
> thanks. david
If you're standing on the +ve terminal of a battery and "look" at the
-ve terminal then you will say "I am +ve."
But your friend standing on the -ve terminal will "look" at you're
terminal and say "I am -ve."
Both "views" are correct at the same time.
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