Can't argue that. - WJR
On Mon, Feb 28, 2011 at 09:14, Steven M. Caesare <[email protected]>wrote: > I beg to differ. Many things have been suffered due to me. > > > > -sc > > > > *From:* Doug Hampshire [mailto:[email protected]] > *Sent:* Monday, February 28, 2011 10:06 AM > > *To:* NT System Admin Issues > *Subject:* Re: QUICK question... A/C adapters > > > > It's not just his ego that's insufferable...... > > On Fri, Feb 25, 2011 at 5:06 PM, William Robbins <[email protected]> > wrote: > > Don't encourage -sc...his ego is insufferable as it is. ;) > > - WJR > > > > On Fri, Feb 25, 2011 at 15:51, Jonathan <[email protected]> wrote: > > +1 SC is dead on here. Match the voltage (and the polarity, if DC), and > match or exceed the current rating (amps) or the power rating (watts) and > you'll be fine. Typically (for barrell connectors, anyway, you'll find that > the size of the connector has to do with the voltage and or amperage of the > supply. > > > > On a related note, I always appreciate when one of my computer geek > colleagues quotes Ohm's law. > > > > ....or Kirchhoff's law... > > > > The sum of the currents entering a circuit equal the sum of the currents > exiting the circuit. > > > > Jonathan > > On Fri, Feb 25, 2011 at 1:20 PM, Steven M. Caesare <[email protected]> > wrote: > > No, Ben is correct here. > > > > The resistive load (simplifying, as most modern load have inductive or > capacitive components in addition to purely resistive loads), is heat will > determine how much he current draw will be. > > > > Ohms law tells us I = V/R > > > > I-current > > V=voltage > > R=resistance > > > > Therefore if your supply voltage(V) is 14 volts, and the load resistance(R) > is 7 ohms, then the current draw (I) will be 2 amps. > > > > Thus your power supply must be capable of supplying at LEAST 2 amps[1], it > may be able to supply more, but the system would simply never draw it. A > 500A power supply would no more require the load to “dissipate more heat” > it than a 2A power supply would. > > > > -sc > > > > [1] And incidentally, power (W) = V*A. Therefore our theoretical power > supply in this case would be supply 28W of power[2]. I not this because > power supplies are often capable of varying voltage and/or are rated in > watts. > > [2] Ignoring power efficiency factors for the moment. > > > > *From:* Jonathan Link [mailto:[email protected]] > *Sent:* Friday, February 25, 2011 1:07 PM > > > *To:* NT System Admin Issues > > *Subject:* Re: QUICK question... A/C adapters > > > > It would depend on whether you can trust the resistor to dissapate the > extra heat generated by additional current. It's not something I would do > over the long term... > > > > > > On Fri, Feb 25, 2011 at 12:57 PM, Jim Holmgren <[email protected]> > wrote: > > Matt, > I believe you are correct. Also not an EE, but in about 10 years of > working for RadioShack, that was the mantra. > > The device will only draw the amperage it needs, but it must have the > correct voltage. > > Jim > > > Jim Holmgren > Senior Manager, Infrastructure Services > XLHealth Corporation > The Warehouse at Camden Yards > 351 West Camden Street, Suite 100 > Baltimore, MD 21201 > 410.625.2200 (main) > 443.524.8573 (direct) > 443-506.2400 (cell) > www.xlhealth.com > > > > > > -----Original Message----- > From: Matthew W. Ross [mailto:[email protected]] > > Sent: Friday, February 25, 2011 12:49 PM > To: NT System Admin Issues > Subject: RE: QUICK question... A/C adapters > > I am not an electrical engineer, so please do not take this as power > supply advice: > > I have been told that as long as the voltage is correct, you can go over > > on the amperage with your PS. So, if you have something that requires > 9V, 1 amp PS, and you have a 9 volt, 2 amp... you're good to go. The > device will only pull as much amperage as it requires. > > Voltage is specific, as I'm told. Don't mess with it. AC and DC don't > mix, etc, etc... > > Again, don't use this as any kind of real advice. Somebody with real > electrical engineering experience can verify or tell me I've been told > wrong. Sm:)e. > > > --Matt Ross > Ephrata School District > > > ----- Original Message ----- > From: Maglinger, Paul > [mailto:[email protected]] > > To: NT System Admin Issues > > [mailto:[email protected]] > Sent: Fri, 25 Feb 2011 > 09:32:57 -0800 > > Subject: RE: QUICK question... A/C adapters > > > I go with 3rd party when there is a significant cost savings. Case in > > point, we use a particular print server. The power supplies are > > notorious for going bad. We cannot purchase the OEM power supplies > > alone and the entire package runs about $120. I found replacement > power > > supplies for $7.50 online. Just make sure that the voltage, current, > > polarity, and the connector size all match up! > > > > I have been known to go slightly higher in the current capacity so > they > > don't run as hot. Note that I said "slightly". > > > > -Paul > > > > > -----Original Message----- > > From: John Aldrich [mailto:[email protected]] > > > Sent: Friday, February 25, 2011 11:27 AM > > To: NT System Admin Issues > > > Subject: RE: QUICK question... A/C adapters > > > > > Thanks guys... I'll keep monitoring, although it sounds like the > > consensus > > of opinion so far is that 3rd party is OK. :-) > > > > > > > > > > -----Original Message----- > > From: Matthew W. Ross [mailto:[email protected]] > > > Sent: Friday, February 25, 2011 12:10 PM > > To: NT System Admin Issues > > Subject: RE: QUICK question... A/C adapters > > > > > *grabbs the "Dell" AC adapter under his desk and checks who actually > > manufactured it.* > > > > It appears that Dell doesn't make their own, this one is made by > Delta. > > (A > > well known PS manufacturer.) > > > > I'm sure Dell has some very specific requirements for their power > > supplies. > > > > But, I will say that any reputable aftermarket PSs are likely trying > to > > be > > as close to the specs as possible for the intended use. YMMV. > > > > > > --Matt Ross > > Ephrata School District > > > > > > ----- Original Message ----- > > From: Ames Matthew B > > [mailto:[email protected]] > > > To: NT System Admin Issues > > > [mailto:[email protected]] > > Sent: Fri, 25 Feb 2011 > > 08:59:07 -0800 > > > Subject: RE: QUICK question... A/C adapters > > > > > > > > Personally I would get a proper one direct from the manufacturer. > You > > > hardly want a cheapo PSU bein left on and causing a fire. > > > > > > Pretty sure that Dell a good few years ago did a recall for a dodgy > > > batch of laptop PSU (at least in the UK), I doubt you would get that > > > sort of service from an Amazon seller. > > > > > > > > > > -----Original Message----- > > > From: John Aldrich [mailto:[email protected]] > > > > Sent: 25 February 2011 16:47 > > > > To: NT System Admin Issues > > > Subject: QUICK question... A/C adapters > > > > > > Are A/C adapters something you guys would ONLY buy from the OEM or > is > > an > > > aftermarket OK on something like that? I got the OEM to come down > > about > > > $10, but they're still about $10 higher than Amazon... if you guys > > think > > > that's something that should come from the OEM, I'll go with them. > > I'll > > > look for your answers until Monday and make a decision based on the > > > consensus of opinion then. :-) (See... I can be patient. :-)) > > > > > > > > > > > > > > > > > > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ > > > <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > > > > > --- > > > To manage subscriptions click here: > > > http://lyris.sunbelt-software.com/read/my_forums/ > > > or send an email to [email protected] > > > with the body: unsubscribe ntsysadmin > > > > This email and any attachments to it may be confidential and are > > > intended solely for the use of the individual to whom it is > > > addressed. 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Si usted no es el destinatario, por favor, póngase en contacto > con el remitente por teléfono y destruir todas las copias del mensaje > original > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin > > > > -- > Jonathan, A+, MCSA, MCSE > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin
