From: "Olin Lathrop"
Subject: Re: [EE:] 110v olt motors on 230v mains


> Mike Hawkshaw wrote:
> > But, you have 2 coils in parrallel, so there are twice the I^2R losses
> > overall...
>
> No.  Look at each coil individually.  Let's say each coil draws 1A at
110V,
> and the DC resistance is 500mOhm.  That means 500mW is lost in heat in
each
> coil.
>
> If you drive the two coils in parallel from 110V, each coil sees 110V,
draws
> 1A, and dissipates 500mW for a total of 1W.
>
> If you drive the coils in series from 220V, each coil sees 110V, draws 1A,
> and dissipates 500mW for a total of 1W.
>
> Same thing.

Of course, you're right. Thanks for making it clear(er). It is only losses
in transmission that make any difference.

Cheers...Mike.



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