2 P=U2/R=10W
3空:I=110V/484歐=0.225A???????????????
1.???P=UI??? I=P/U??????
2??????????P=UI=U2/R??? R=U2/P,????????????????????1210?
3 ??110V??·?У????費(fèi)????P=U2/R=(110V)2/1210?=10W
4???????????I=U/R=110??/1210?=0.091A
1.???P=UI??? I=P/U??????
2??????????P=UI=U2/R??? R=U2/P,????????????????????1210?
3 ??110V??·?У????費(fèi)????P=U2/R=(110V)2/1210?=10W
4???????????I=U/R=110??/1210?=0.091A