Ohm's law does not apply here, all 3.5" HD power supply are switching power
supply, no matter you connect the load or not there is power consumption but
it is very small (~1W perherps, depends on the design). At the mean time
most 3.5" HD with USB interface will turn off when USB is unplugged but
there is still a small trace of current running to support the interface
circuit, again it is very small.
C.H.Ling
----- Original Message -----
From: "Fernando Gonzalez Gentile" <fgonzalezgentile@xxxxxxxxx>
> LOL :-) I certainly have, 'till I found this thread which remembered
> me about something I had to do - go down there and touch the
> mistrusted AC/DC !
> Whatever the outcome of my temperature-test, I wouldn't know if
> agreeing with your last sentence would be wrong or right."With the HD
> off, there's no load, so no heat." was what I was expecting to read.
> Then, I have not forgotten Ohm's law :-)
>
> Fernando.
>
> 2010/7/4 Moose <olymoose@xxxxxxxxx>:
>
>>> But now I've just touched it and found it's cold despite I've never
>>> unpluged the DC end from the HD.
>>> Maybe the circuit remains open until the USB gets pluged.
>>
>> I think you are just borrowing trouble, Fernando. Don't you have other
>> things to worry about - or even more enjoyable
>> things to do than worry? :-)
>>
>> I don't know what rules are in Uruguay, but I would guess that
>> manufacturers that sell in world markets wouldn't bother
>> sending anything but their UL, CSA, EU approved units. If the unit has
>> any of those approvals on the case, just leave it
>> plugged in and don't worry about it.
>>
>> If it's cold to the touch with the HD on, it's amazing and over built.
>> Warm is normal. With the HD off, there's no load,
>> so no heat.
--
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