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