A strain gauge forms one arm of the bridge shown in the figure below and has a nominal resistance without any load as R. = 300 N . Other bridge resistances are R₁ = R₂ = R3 = 300 N . The maximum permissible current through the strain gauge is 20 mA. During certain measurement when the bridge is excited by maximum permissible voltage and th strain gauge resistance is increased by 1% over the nominal value, the output voltage V₁ in mV is + Rs www R3 V 0 + R₁ R₂

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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.