Which statement best describes the output of a Wheatstone bridge used with a strain gauge in one arm?

Which statement best describes the output of a Wheatstone bridge used with a strain gauge in one arm?

• A. The output is a single-ended voltage proportional to absolute resistance.
• B. The output is a current that flows through the bridge.
• C. No output until the bridge becomes perfectly balanced.
• D. The output is a differential voltage proportional to the strain-induced resistance change.

Answer: (D)