Which transducer is used to measure force and produce a signal proportional to the force?

Which transducer is used to measure force and produce a signal proportional to the force?

• A. Strain gauge
• B. Capacitive sensor
• C. Load cell
• D. Pressure transducer

Answer: (C)

A load cell is designed to convert an applied force directly into an electrical signal that is proportional to that force. Inside a load cell, a metal element deforms slightly under load, and strain gauges bonded to this element experience changes in resistance. These gauges are wired in a Wheatstone bridge so the minute resistance changes produce a voltage output, which, after calibration, corresponds linearly to the applied force. A strain gauge alone isn’t enough because it just senses strain; it needs the supporting structure and electronics to turn that strain into a force value. A capacitive sensor detects changes in capacitance from displacement, not force itself, and a pressure transducer converts pressure into a signal, which is a different measurement context.

A load cell is designed to convert an applied force directly into an electrical signal that is proportional to that force. Inside a load cell, a metal element deforms slightly under load, and strain gauges bonded to this element experience changes in resistance. These gauges are wired in a Wheatstone bridge so the minute resistance changes produce a voltage output, which, after calibration, corresponds linearly to the applied force.

A strain gauge alone isn’t enough because it just senses strain; it needs the supporting structure and electronics to turn that strain into a force value. A capacitive sensor detects changes in capacitance from displacement, not force itself, and a pressure transducer converts pressure into a signal, which is a different measurement context.