W=P*t =450w*60s =27kjp=U^2/誉唯渗团R=220^2/庆喊培1210=40wW=P*t=40*600=2.4kj
1. Q=pt=450w×60s=27000J2.p额罩闭=U×U/基悔R=220v×220v/1210欧=40w Q=pt=40w×600s=24000J 搏闷正p=UI=UU/R=I I R=W/t w=UIt=UU/Rt=I I t=pt
不太会算