I am trying to understand physics.units.  Here is an ipython session
illustrating my mental block

In [32]: from sympy.physics.units import *

In [33]: V/ohm
Out[33]: A         <-- This makes sense.

In [34]: A*ohm
Out[34]: m**2*kg/(A*s**3)  <-- Why not 'V'?

In [35]: V/A
Out[35]: m**2*kg/(A**2*s**3)  <-- Why not 'ohm'?

In [36]: W/A
Out[36]: m**2*kg/(A*s**3)  <-- Why not 'V'>

In [37]: V/ohm
Out[37]: A       <-- Again this makes sense.

In [38]: W/V
Out[38]: A   <--  This makes sense.

In [40]: 1/s
Out[40]: 1/s <-- Makes sense but might be 'hz'?

In [42]: sympy.__version__
Out[42]: '0.6.4.beta1'

Can someone explain this behavior and maybe shed some light on how I
could get this to work the way that I think it should?

Thanks,
Bill

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