I have noticed in the unit systems module I get odd behavior trying to 
convert to a unit that does not match the expression.  For example after 
importing 

>>> from sympy.physics.units import *

and executing 

>>> convert_to(5*V, ohm)
I get 
5*10**(1/3)*ohm**(8/9)

but other times it behaves as I would expect,  such as 

>>> convert_to(5*joule, m)
5*joule

Any ideas why this is occurring?  

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