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Home > Archive > Electrical Engineering > March 2007 > Basic Electrical Question
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Basic Electrical Question
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| nickjax01@gmail.com 2007-03-23, 1:25 pm |
| Hello,
I'm sure this will be an easy question for you all who are in the
business.
I need to wire a room to power up computers (desktops and monitors).
I know the room has 20 amp circuits. I'm having a hard time
understanding what the labels on the computers say they need versus
what I know is in the room. For example, a monitors power
requirements are 100-240V 50-60Hz 1.8 A and the desktop requirements
are 115/230V 6.0/3.0A Hz: 50/60.
Now, I'm pretty sure 1.8a and 6.0/3.0a are the AMPS. However, I'm
confused by the second one (6.0/3.0a). What does that mean? Why
isn't it one or the other?
Thanks.
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| Palindrome 2007-03-23, 1:25 pm |
| nickjax01@gmail.com wrote:
> Hello,
>
> I'm sure this will be an easy question for you all who are in the
> business.
>
> I need to wire a room to power up computers (desktops and monitors).
> I know the room has 20 amp circuits. I'm having a hard time
> understanding what the labels on the computers say they need versus
> what I know is in the room. For example, a monitors power
> requirements are 100-240V 50-60Hz 1.8 A and the desktop requirements
> are 115/230V 6.0/3.0A Hz: 50/60.
>
> Now, I'm pretty sure 1.8a and 6.0/3.0a are the AMPS. However, I'm
> confused by the second one (6.0/3.0a). What does that mean? Why
> isn't it one or the other?
>
The higher the voltage, the lower is the current needed for a particular
unit.
Thus your desktop needs 6 amps if powered from a 115v supply but only 3
amps, if connectd to a 230v one. The electrical power consumed will be
near enough the same, as power equals volts multiplied by amps.
Your monitor will also take a different current when connected to a
different voltage supply. It's just that they haven't (apparently) put
both currents on the label. Try the detailed spec in the manual, or ask
the monitor's manufacturer.
--
Sue
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| MassiveProng 2007-03-24, 3:25 am |
| On Fri, 23 Mar 2007 16:21:34 GMT, Palindrome <me9@privacy.net> Gave
us:
>nickjax01@gmail.com wrote:
>
>The higher the voltage, the lower is the current needed for a particular
>unit.
>
>Thus your desktop needs 6 amps if powered from a 115v supply but only 3
>amps, if connectd to a 230v one. The electrical power consumed will be
>near enough the same, as power equals volts multiplied by amps.
>
>Your monitor will also take a different current when connected to a
>different voltage supply. It's just that they haven't (apparently) put
>both currents on the label. Try the detailed spec in the manual, or ask
>the monitor's manufacturer.
Most auto switching PSs are a little bit more efficient at the upper
end. Nothing very noticeable though... just a couple of percentage
points, and a bit better on power factor.
Not sure about the ones where a switch has to be flipped.
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