Metal-Wire Strain Gauge
- A strain gauge is:
An electrical sensor whose resistance varies with applied force
- It does this by converting the force into a change in electrical resistance
- A metal-wire strain gauge consists of:
- A folded thin metal wire
- On a flexible plastic casing
Extension v Resistance of Strain Gauge
- As the strain gauge is extended, its resistance also increases and vice versa
- This means for tensile strain:
- Resistance is increased
- For compressive strain:
- Resistance is decreased
