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 {HEAD ~ an electrical load} connected to 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 { HEAD ~ an electrical load } connected to 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH