(1 )R =U 额 2/P 额=(220V) 2/25W = 1936Ω
(2)W =10kWh/3000 = 1.2×10 4J
(3)P 实= W/t = 1.2×10 4J/750s = 16W
(4)U 额 2/P 额= U 实 2/P 实
(220V) 2/25W = U 实 2/16W
U 实= 176V
(1 )R =U 额 2/P 额=(220V) 2/25W = 1936Ω
(2)W =10kWh/3000 = 1.2×10 4J
(3)P 实= W/t = 1.2×10 4J/750s = 16W
(4)U 额 2/P 额= U 实 2/P 实
(220V) 2/25W = U 实 2/16W
U 实= 176V