用电器在一定时间内消耗电能的多少用电能表测量,消耗1kW?h的电能,电能表转3000转,电能表转了15转,消耗的电能:W=153000kW?h=0.005kW?h,用电器的实际功率:P=Wt=0.005kW?h360h=0.1kW=100W.故答案为:电能;100.