Escapade!
An interactive fiction by Juhana Leinonen (2008) - the Inform 7 source text
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The power dial is a dial. It is part of the flux capacitor. The description is "The power dial goes from zero to 1.21 gigawatts. It's currently pointing at [if the flux capacitor is powered]the maximum.[otherwise]zero."
Understand "zero" and "gigawatt/gigawatts/jigawatt/jigawatts" as the power dial.
Should the game choose when comparing the power dial against the speed dial and ( turning or pushing ):
it is a good choice. [just so that it skips the disambiguation question.]