9.1
测量家庭用电总消耗。
测量家庭用电总消耗。
如今,大多数当选仪表都有一个二极管,该二极管会随着消费而逐步传递脉冲。二极管标记为“ 1000 Imp / kwh”。将手机的摄像头放在二极管上并测量消耗。二极管可能以红外线传输,因此它不会对人眼可见,但是手机上的相机会看到它。
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