功率为1500W，电器每小时使用1.5度。耗电量=耗电量*耗电持续时间，然后耗电持续时间=耗电量/耗电量，也就是耗电持续的时间=1/1.5=2/3，所以1500瓦的家电需要三分之二小时和一度的电量。千瓦时通常被称为“度”，是电功率的单位。符号为千瓦时。计算公式是幂乘以时间。
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