Transformers are devices that transfer electrical energy from one circuit to another. They exist in all sorts of different types of electrical equipment.
I’ve never seen a robot in disguise, but then I suppose I wouldn’t know if it was in disguise!
do you mean tools to change frequency in alternate currents (of course they exist, and this is why we all have alternate currents in our homes, even if it leads to more dispersion than DC), or something more exotic?
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