家庭用电量怎么计算

一般家庭交电费的时候是按自己家这个月使用了多少度电，一度电按0.5元左右算的，比如这个月用电100度，电表上会显示的，那么这个月电费就是100度
x
0.5元＝50元。那么这100度电是怎么得出来的呢？
家用电器一般都标有功率，这个功率的意思就是这个电器开启一个小时能耗几度电，1000瓦＝1度电，也就是标注功率为1000瓦的电器开启一个小时就耗1度电。那么一般的电器功率是多大呢？比如洗衣机功率大约为100瓦左右，那么一个小时就能耗0.1度电，热水器一般为1200瓦左右，那么开启一个小时就能耗1.2度电，还有一点要注意，电器上标注的功率是连续开启一个小时耗的电量，如果开半小时那就只耗标称功率一半的电量。

用电器的功率乘上使用时间（累计时间）就等于用电量。公式；KW*H=电量。用电量乘上当地的电价就是费用（元）。

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