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24w灯开12小时耗电0.288度电。24w=0.024kw,0.024kw/h一小时耗电为0.024度电左右,电功率为0.024kw,1度=1kw/h,即W=Pt,P=0.024kw;W=Pt=0.024kw×1h=0.024kw/h,所...