Where,
P = Power
F = Force at the pedal
V = Velocity
C = Cadence
So in simple terms, if I ride for one hour up hills, into a head wind it may require 1000 kilojoules (kj) of work. But if I was cruising along an easy flat surface with a nice tail wind, it may take me 2.5 hours to do the same amount of work. This method also provides a great way to determine the amount of calories that are burned as well.
Totally paraphrasing this poor guy's article, go check it out at the link above.
Anyway, I thought I needed to add this little gadget to my new gear. Bit pricey for a newbie, but someday I am jumping on this.
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