Is There Alternating Current in Harry's World?

[Carol]

No: HPFGUIDX 184203

Potioncat:
> I always thought, though there's nothing to confirm it in canon,
that when the Muggleborn kids went home, the electronics would mess
up. TV reception would be fuzzy, the microwave would burn things. That
sort of thing. <snip>

Carol responds:
But the Dursleys' TVs worked fine when Harry was around. He even
managed to watch them occasionally. We never see him interfering with
the "eckeltricity," either. No problems with the refrigerator or the
stove, for example, and Dudley's Play Station (anachronism, I know!)
works fine till he throws it out the window (IIRC).

So I don't think it's the presence of magical people, even hundreds of
them, so much as all those wands and magical instruments and the magic
of Hogwarts itself (say the RoR and the various protective spells,
including Muggle-repelling spells) that prevents electricity and
electronics from working at Hogwarts.

Carol, regretfully snipping your imaginative scenarios