Peter, et al,

Does not the total impedance include the real, or horizontal component AND
the imaginary, or vertical (Reactance?)

&/or is the total Z not needed to find the phase shift?

Chris


> *>> P = 15 W
> *>> U = 96 V
> *>> I  =  0,15 A
> *>> unloaded resistance = 108 ohm.
>
> Ztot (real) = U/I = 640 Ohms real
>
> (in phase pointer vector triangle):
> cos (Phi) = R/Ztot = 108/640 = ~ 0.169 (this is not good, you
> need 0.8 or
> above at least for mains operation - there are some
> exceptions though). To
> compensate it add a capacitor with Zc ~= 630 Ohms in parallel with the
> voltage input. That is almost exactly 5uF at 50Hz (1% off). As always
> check my numbers ;-)

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