问题 填空题

(4分)小明家电能表上个月底表盘数字是,这个月底表盘数字如图所示,可知他家本月用电     度,他只让某电水壶工作,发现在10分钟内该电能表转盘转过了600转,则该电水壶的实际功率为     W.

答案

100;1200

题目分析:(1)电能表计算本月用电的方法是:月末的减去月初的示数,电能表的读数时注意最后一位是小数,单位kW•h;

月底电能表示数W2=1362.5kW•h,小明家本月用电:W=W2-W1=1362.5kW•h-1262.5kW•h=100kW•h=100度.

(2)3000r/kW•h表示的是接入这个电能表的电路中每消耗1kW•h的电能,电能表的转盘转3000r,或者表示电能表每转1r,电路中消耗1/3000kW•h的电能,电能表转盘转动600r,电路消耗的电能为:W'=600×1/3000kW•h=0.2kW•h,

电热水壶单独工作的时间;t=10min=1/6h,电热水壶的实际功率:

阅读理解
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