(1)用电器的电流:I=
U
R =
220V
484Ω ≈0.45A
(2)用电器的实际功率:P=
U 2
R =
(220V) 2
484Ω =100W.
(3)工作5min电流做功:W=Pt=100W×300s=30000J.
答:(1)通过该用电器的电流是0.45A;
(2)该用电器的实际功率为是100W;
(3)工作5min电流做功30000J.
(1)用电器的电流:I=
U
R =
220V
484Ω ≈0.45A
(2)用电器的实际功率:P=
U 2
R =
(220V) 2
484Ω =100W.
(3)工作5min电流做功:W=Pt=100W×300s=30000J.
答:(1)通过该用电器的电流是0.45A;
(2)该用电器的实际功率为是100W;
(3)工作5min电流做功30000J.