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