Wanpela 'relay' em i wanpela 'electrical control device' we, taim ol i givim wanpela 'input quantity' na holim inap longpela taim, dispela i save kamapim wanpela 'predetermined step change' long 'controled quantity' insait long wanpela 'electrical output circuit'. Taim input kwantiti i go daun long wanpela level na ol i holim inap longpela taim, em i go bek long namba wan stet bilong en.
Reit Opereting Voltej: Dispela i makim voltej we 'relay coil' i nidim long wok gut. I dipen long model bilong 'relay', em inap long AC o DC voltej.
② DC Resistance: Dispela i makim DC resistens bilong 'relay coil', we ol i ken skelim wantaim wanpela 'multimeter'.
Pulim-in Karent: Dispela em i minimam karent we i mas i stap bilong 'relay' i ken wok. Long taim bilong yusim nomol, karent i mas bikpela liklik long pull-in karent bilong mekim wok i stap gut. Voltej bilong wok i no ken winim 1.5 taims bilong voltej bilong wok; sapos nogat, bikpela pawa bai kamap, na dispela inap long kukim koil.
Rilis Karent: Dispela em i mak bilong karent we i mas i stap bilong 'relay' i ken lusim. Taim 'current' insait long 'pull-in stet bilong 'relay' i go daun long wanpela mak, 'relay' i go bek long 'unenergized release state' bilong en; karent long dispela taim em i liklik tru long pull-in karent.
Kontek switsing voltej na karent: Dispela i makim voltej na karent we rilei i ken putim. Em i save makim bikpela bilong voltej na karent we rilei inap long bosim. Dispela mak i no ken winim taim yu yusim, sapos nogat ol 'relay contacts' inap long bagarap hariap.
