You put a smart meter in your home, and you see how much electricity you're using right now, how much it's costing you, your kids go around and turn the lights off pretty quickly.
比如你放一个智能电表在家里, 当你看到电表显示你正在用多少电， 告诉你花掉多少钱的时候, 你的小孩会很快的去把灯关掉。