How does a Dyno Really Work?

RustyRatRod said

But you cannot know HP is even THERE until the dyno spins and makes the conversion. Right? RIGHT?

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True to measure an engines work potential you got to give it a job first and see how it does, aka dyno, quarter mile, hauling a trailer etc.. But you can't measure torque without given it a job either, free revs won't tell you the torque.