∵U 额=220V、P 额=600W,
∴I=
P 额
U 额 =
600W
220V ≈2.7A,
又∵t=0.5h,P 额=600W=0.6KW,
∴W=P 额t=0.6KW×0.5h=0.3KW•h.
故答案为:2.7,0.3.