What is a strain gauge?

Select one alternative:

strain gauge is a component that changes capacitance when mechanically deformed

(change its capacitance with change of deformation)

strain gauge is a component that changes electrical resistance when mechanically

deformed (change its electrical resistance with change of deformation)

strain gauge is a component that changes electrical resisters with change of inductivity of

the conductive wire that forms the strain gauge (change its electrical resistance with

change of inductance)

strain gauge is a component that changes voltage (generate a voltage) when

mechanically deformed (generate voltage with change of deformation)