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Tags about quantities: should we have them?

I've noticed there are a lot of tags referring to general physical quantities (e.g. `current`, `voltage`, `frequency`) 

I'm not sure if they are useful. For example, what usage would have the tag `voltage`? If a question is about a particular voltage, e.g. breakdown voltage for a diode or threshold voltage for a comparator, then one would probably use a more specific tag.

But "voltage" alone? OK, one could ask a question about the meaning of voltage or the like, but otherwise it seems a tag prone to become a kitchen sink.

For example, at the time of this writing, there are 46 questions tagged `voltage` and they cover a bewildering range of subjects, for example:

+ Cables voltage ratings.
+ Testing on induction motor.
+ Analog computer operations.
+ Transformer phasor graphs.
+ Arc welding.
+ Various examples of circuit analysis.
+ Tunnel diode modeling.
+ Semiconductor devices equations.
+ etc.

Is it useful a tag that can be applied to such a wide variety of questions? What usefulness would people get to click on that tag and browse all the tagged questions?

And if we decided to get rid of it (and similar general tags), what would we use for questions that are actually on voltage itself as a concept?