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插头上有两个小洞洞，您知道它有什么用处吗？别小看它哟，它的作用其实可不小啊！

插头插入插座，为何能通电呢？原因是因为插头插入插座时，有两个夹片将插头上的金属片扣合。不过随着使用年限增加，金属片会逐渐松动，因此有了两个小洞洞，就能与插座内部的弹片“卡好卡满”，达到固定效果。

小孩玩插座出事时有所闻，一些父母会特地买锁头将插头上的两个小洞洞锁住。有些插座则是带锁的，插头插入后按下开关，就会往孔里插入一根金属棍，起到“锁死”作用。

当然，还有一个作用是出厂封装时，厂商会在孔洞穿过一条塑料绳悬挂注意事项，以确保使用者拆封前先看一看使用说明。