{TAIL ~ Electrons} may be collected using positive electrical terminals 214, such as {HEAD ~ an anode} 
{ TAIL ~ Electrons } may be collected using positive electrical terminals 214 , such as { HEAD ~ an anode }
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD