A diaphragm full-Wheatstone-bridge strain transducer has R₁,R₄ in compression and R₂,R₃ in tension. Every resistor is 200 Ω unloaded and changes by 20 Ω under force. Bridge excitation is 10 V. Find output Vout in volts, nearest integer, using the shown connections.
Compression reduces R₁,R₄ to 180 Ω and tension raises R₂,R₃ to 220 Ω in the source’s strain-gauge model. The two midpoint voltages are 10×220/400=5.5 V and 10×180/400=4.5 V. Their difference has magnitude one volt. Reversing unspecified output polarity gives −1 V, and the official key accepts both −1 and +1.
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