Discussion
The gauge factor of a strain gauge is the ratio of
Answer: A
Correct answer: Fractional resistance change to strain
The gauge factor is defined as
\[ GF = \frac{\Delta R/R}{\varepsilon} \]
so it relates a fractional resistance change to the strain producing it, and is itself dimensionless. For a metal foil gauge it is about 2, meaning a strain of 0.001 gives a resistance change of 0.002 - two parts in a thousand.
Semiconductor gauges reach 100 or more but are far less stable with temperature. The ratio of strain to stress is the reciprocal of Young's modulus, a property of the material rather than of the gauge.
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