w
E1 = -------- f
[Omega] (1.)
If R be the resistance in circuit by Ohm's law,
E - E1
C = --------
R
w
= E ------- f(C)
[Omega]
----------------
R
and therefore
[Omega](E - CR) (2.)
w = -----------------
f(C)
Let _a_ be the efficiency with which the motor transforms electrical
into mechanical energy, then--