What is strain gauge ?

Engineer

 

Strain gauge if a metal conductor is stretched or compressed , it resistance changes on account of the fact that both length  and diameter of conductor change also there is a change in the value of registivity of the conductor when it is strain and these property is called piezo resistive effect.

Therefore, resistance strain gauge also called piezo resistive gauge.

                          Strain gauge is passive transducer. That uses variation in electrical resistance in wires to sense the strain produce by a force on wire.

★ Classification of  strain gauge :-