1千瓦时的物理意义是：功率为1kW的电器，工作1小时所电能消耗。功的单位有焦耳和千瓦时，两者之间的关系如下：1焦＝1瓦×秒。1千瓦时＝1千瓦×1小时＝1000瓦×1小时＝1000瓦×3600秒＝3600000焦。即：1千瓦时＝3.6×10^6焦。
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