A bridge circuit, as shown in Figure 1, is used to measure the value of the unknown Resistance Ru of a strain gauge of nominal value 500 2. The output voltage measured across points DB in the bridge is measured by a voltmeter. Calculate the measurement sensitivity in volts/ohm change in Ru if: (a) the resistance Rm of the measuring instrument is neglected, and (b) account is taken of the value of Rm. 500 2 10V 5000 n 5000 A 1. 10 ka Figure 1

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Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.