How Do You Calculate UAB in a Wheatstone Bridge with Changing Resistance Values?

[commelion]

looking for some help for the second part of this question.

i got 60 ohms for part one

the answer to part 2 shows (delta v = 4.44mv) not sure how to calculate this or what is voltage resolution.

regards

 

[NascentOxygen]

If the sensor resistance changes to 60.1 ohms, what will be the voltage difference between A and B? The voltage detector (e.g, voltmeter) must be able to register this small voltage, otherwise the sensor won't be of any use for the intended purpose.

 

[ehild]

Starting with the balanced Bridge, (R3=60) calculate UAB when R4 changes by 0.1 ohm with respect to the nominal 60 ohm. Take care: the figure shows 15 V for the voltage of the battery, the text says 12 V, and you have to use this value.

ehild