I define "power" as the time rate of doing work (in watts).
However, I also mention the "power" of a lens (in diopters) and the
"chromatic resolving power" (no unit) of a diffraction grating. I
tell my students that these last two "powers" are misnamed and that
the more general term "strength" might be better.
Except we've already discussed "dielectric strength", which is
actually a maximum electric field magnitude (in V/m or N/C).
And some wonder why students get so confused about the simplest things.
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