Converting a quantity to a decimal form [closed]

Question

I have a function giving me this:

(5 Coulomb)/(6 Second)

as output. I want this in decimal form and would like to have the variables taken off the end for unit analysis. How would I do this? I have tried NumberForm, but I think that the unassigned variables I am using for units are throwing it off.

EDIT: Here is what I have for code

In[1]: f[P_, V_] := P/V
In[2]: f[100 W, 120 V]
Out[2]:(5 Coulomb)/(6 Second)

I took your advice and put:

In[1]: f[P_, V_] := P/V
In[2]: f[100 W, 120 V]//N[#]&

And got:

Out[2]:(0.833333 Coulomb)/(Second)

Answer 1

To be a bit more systematic, I would suggest declaring the units you want to work with in a global variable, and then defining a function unitsToUnity that sets all of those units to unity as follows:

$myUnits = {Coulomb, Second};

unitsToUnity[expression_] := 
 expression /. Thread[$myUnits -> 1]

(5 Coulomb)/(6 Second) // unitsToUnity

(* ==> 5/6 *)