Longer XO transformer power cord in the plans?

[Tiago Marques]

On 5/31/09, James Cameron <quozl at laptop.org> wrote:
> I know of no such plans, but the physics of the configuration has a
> bearing ...
>
> 1.  a longer cable has a larger voltage drop, and so a greater amount of
> power is lost as heat, leading to greater inefficiency of power use,
>
> 2.  compensating for the voltage drop can only be done by either raising
> the design voltage on the cable, or increasing the cross sectional area
> of the copper,
>
> 3.  raising the design voltage is an unattractive option, since it would
> expose the user to greater risk,
>
> 4.  increasing the cross sectional area would make the cable much
> heavier, and a substantially higher cost, which would vary according to
> metal prices,
>
> 5.  increasing the length may also increase the trip hazard, and so
> further reinforcement of the sheath and restraint points may be
> required,
>
> 6.  not every child will need an extra two metres.

I have no idea of the kind of infrastructures kids have on the target
market of the project, at least in developed countries it is a
necessity for me, hence the e-mail I sent.

>
> Can you balance this against against the cost of properly placed
> domestic 110V or 240V outlets?

Nope, I understand that.

Best regards,

Tiago Marques

>
> --
> James Cameron    mailto:quozl at us.netrek.org     http://quozl.netrek.org/
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