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A typical electric weight scale consists of a load cell, a micro controller and a display.
The load cell is where the magic happens.
As the load increases, the metal is bent. On top of the bending metal is a strain gauge.
As the strain gauge is stretched, its electrical resistance (ohms) changes.
The microcontroller reads the change in the resistance and assigns a number to the result.
The microcontroller then displays the weight on the display.
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