# Gauge factor

## Description

Strain gauge is a device used to measure strain on an object. A strain is a normalized measure of deformation representing the displacement between particles in the body relative to a reference length. Strain measures how much a given deformation differs locally from a rigid-body deformation.

Gauge factor (GF) or strain factor of a strain gauge is the ratio of relative change in electrical resistance R, to the mechanical strain.

## Variables

G_{F} | Gauge factor (dimensionless) |

DR | The change in resistance caused by strain (ohm) |

R_{G} | The resistance of the undeformed gauge (ohm) |

ϵ | The strain (absolute change in length/original length) (dimensionless) |