Many measurements cannot be used for control until they are converted to physical quantities (like electric
voltage or current, or a pneumatic signal, i.e. compressed air or liquid) which can be transmitted easily.
The transducers or transmitters are used for that purpose.For example, the Strain Gauges are metallic
conductors which change their resistance when subjected to mechanical strain. Thus, they can be used to
convert a pressure signal to an electric one.
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