Electricity vs Magic?

[classicdrogn]

My favorite theory is that because electronic devices rely on mass produced semiconductors to function, the laws of similarity and contagion mean that when immersed in a high-magic area they stop working because the components in that specific device are connected with every other one of the same type and doubly so if they came from the same silicon blank. Wizarding Wireless sets use tubes instead, individually charmed or otherwise protected to avoid being too similar to other tubes of the same model.