1.
source 2.electricalsource 3.powersupply 4.powersource 5.supplysource 6.energysupply 7.mainsupply 8.sourceofcurrent 9.currentsource 10.powersourceofelectricwelding 11.sourceofvoltage 12.sourceofelectricity 13.potentialsource 14.powermains 15.powersupplychangeover