Motor 16 is connected by suitable leads to batteries 20 which provide {HEAD ~ the required electrical power} for operating {TAIL ~ the motor} 
Motor 16 is connected by suitable leads to batteries 20 which provide { HEAD ~ the required electrical power } for operating { TAIL ~ the motor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL