I think that Claudia is going to probably insist that he put on a grounding bracelet and teach him about how to be electrically neutral in the near future.

Probably fair.

It might not save the poor electronics, but who knows.

Some of it will help once Penric's powers settle down. Then you only have 'very smart guy, but he's from the equivalent of 1400CE Europe'.

Claudia will totally have to trot out her big brother's explanations to a precocious midget of how advanced physics works using standard playground equipment.

If it helps, Pen has an intuitive grasp of some unexpected shit thanks to his magic. (Like 'rust is like slow fire' and 'diseases seem to be caused by something living, but very diffuse in the body'.)

And Claudia has some knowledge of crafts that are very old-fashioned.

Like she could probably forge her own tools without having to do research.