What is n in physical P = (FS) △ t = FV = nfv?

What is n in physical P = (FS) △ t = FV = nfv?

Is it in the pulley block? If it is
Then n is the number of segments of the rope in contact with the moving pulley, and F is the resistance to the uniform motion of the object in the horizontal direction

In P = FV, the unit of V is m / s. can it be km / h? Km / S?
I want to know if km / h and km / s can be used in V
By V, I mean V in the formula P = FV

You can use it, but you don't usually use it. We usually use SI units, but if you need to convert when you do individual problems, you can also convert meters (m), kilograms (kg), seconds (s), amperes (a), Kelvin (k), candela (CD) and moles (mol). This is SI unit

Shouldn't v be larger if f is larger? Is it contradictory with P = FV?
First of all, I'm rather stupid. Please forgive me. My question is: according to a = (f-f) / m, where m and F are certain, then the larger f is, the larger a should be. But from the point of view of P = FV, if f increases, the smaller V is. So why does F increase, a increase, and V not increase?

It seems that these two formulas are not related to each other
P is power, right
One is Newton's second law, the relationship between force and acceleration
You didn't think about that P. P may change