----- Original Message -----
From: "Matt Redmond" <mdredmond@CHARTER.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, September 12, 2003 9:48 AM
Subject: [EE:] Simple Question


> I'm sorry about my earlier post - I forgot the [EE:] in
> the subject.
>
> Hi All,
>
> Okay - here's another easy question - forgive my
> ignorance...
>
> When powering a device with a DC adapter (wall-wart type),
> it seems to me that three parameters of the adapter are
> important: Voltage, Polarity and Rated [Current] Output.
>
> Now regarding the quality of a given adapter: You'd
> obviously want voltage to be as stable as possible.
> Polarity is a given. But... As long as the adapter can put
> out the current required by the device, there really isn't
> such a thing as 'current stability' is there? I mean,
> current is determined by voltage and the internal
> resistance of the powered device, right? An adapter
> couldn't just start 'putting out too much current' in the
> same way its voltage might fluctuate, correct?

Sounds right to me but what is the problem??

>
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