Discussion
A piezoresistive pressure sensor works by
Answer: B
Correct answer: Resistors diffused into a diaphragm
Piezoresistive sensors are made by diffusing resistors into a silicon diaphragm. Pressure deflects the diaphragm, straining the resistors, and their resistance changes - the strain gauge principle in an integrated form.
The last option describes a piezoelectric device, which generates charge under stress and cannot hold a static reading. That difference matters: a piezoresistive sensor measures steady pressure, while a piezoelectric one responds only to change and is used for dynamic measurements.
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