The variable resistor changes between two or more different resistance states by applying {TAIL ~ a voltage} between {HEAD ~ the electrodes} 
The variable resistor changes between two or more different resistance states by applying { TAIL ~ a voltage } between { HEAD ~ the electrodes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD