Which term describes a signal conditioning element at the input that provides a DC voltage to the Wheatstone bridge and measures the differential voltage?

• A. u/U
• B. P/U
• C. Amplifier
• D. Transistor

Answer: (B)

When designing a measurement path for a Wheatstone bridge, you need a block that both biases the bridge with a stable DC source and captures the small differential voltage produced by the sensor. That role is filled by the power/excitation unit (P/U). It provides the excitation to the bridge and senses the bridge’s differential output so the signal can be conditioned further for processing.

An amplifier would only boost the differential signal after it’s already produced, not supply the DC excitation to the bridge. A transistor is a basic device used inside many circuits but doesn’t itself describe the dedicated input signal-conditioning and excitation function. The other option isn’t a standard term for this role in this context.