On 4/6/2017 10:38 AM, alister wrote:
> On Thu, 06 Apr 2017 12:36:25 +0000, Martin Gregorie wrote:
>>
>> Fair comment, but I still remember those hot (above blood heat) cables
>> on vacuum cleaners and all the warnings about not leaving power cables
>> coiled up.
>
> the reason for not leaving cables coiled up is because if you do you have
> just created a large & inefficient transformer

Winding a pair of wires that carry current in opposite directions will
not make a transformer.  It may make a common mode choke, but that's not
a problem.

--

Rick C

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