Discussion
A Wheatstone bridge is used with strain gauges because it
Answer: B
Correct answer: Turns a tiny change into a voltage
The gauge's resistance changes by a few parts in a thousand, which no practical instrument reads directly with the required precision. A Wheatstone bridge converts that change into a differential voltage measured against a balanced reference.
Because the bridge output is zero when balanced, the small change appears as a small voltage on a zero baseline rather than as a tiny variation on a large one - which is what makes it amplifiable. The gauge factor is a property of the gauge and excitation is still required.
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