The equation gives {HEAD ~ the dynamic relation} between the voltage U at and {TAIL ~ the power P} through a connection to the load 
between
The equation gives { HEAD ~ the dynamic relation } between the voltage U at and { TAIL ~ the power P } through a connection to the load
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH