The regulator uses a transformer in series with a switching device to cause {TAIL ~ the primary transformer current} to be switched ON and OFF in response to the power needs of an electrical load connected to {HEAD ~ the secondary circuit} 
The regulator uses a transformer in series with a switching device to cause { TAIL ~ the primary transformer current } to be switched ON and OFF in response to the power needs of an electrical load connected to { HEAD ~ the secondary circuit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD