The gain of the differential amplifier is -125. Assume the voltage applied to bridge circuit Vdc=+10v and the unstrained resistance of four element of strain gage is 200Ω. When a certain weight is placed on the platform, the output voltage Vo=5v. Determine the change in resistance of each strain gage for analog weight scale. (Assuming the output is initially nulled).

Question

The gain of the differential amplifier is -125. Assume the voltage applied to bridge circuit Vdc=+10v and the unstrained resistance of four element of strain gage is 200Ω. When a certain weight is placed on the platform, the output voltage Vo=5v. Determine the change in resistance of each strain gage for analog weight scale. (Assuming the output is initially nulled).

asked Jan 15 in Linear Integrated Circuits by Julian (37.1k points)

The gain of the differential amplifier is -125. Assume the voltage applied to bridge circuit Vdc=+10v and the unstrained resistance of four element of strain gage is 200Ω. When a certain weight is placed on the platform, the output voltage Vo=5v. Determine the change in resistance of each strain gage for analog weight scale. (Assuming the output is initially nulled).

(a) 1Ω

(b) 0.8Ω

(c) 0.3Ω

(d) 1.83Ω

I have been asked this question in an online quiz.

My question is based upon High Frequency Op-Amp Equivalent Circuit in chapter Operational Amplifier Applications of Linear Integrated Circuits

1 Answer

Chris · Answer 1 · 2024-03-16T08:01:16+0000

The accurate answer is (b) 0.8Ω

Embark on a journey of understanding with: The output voltage of analog weight scale, Vo = Vdc×(△R/R)×(RF/R1)

=> △R=( Vo/ Vdc)×(R1/RF)×R =( 5v×200Ω)/(125×10v) =0.8Ω.

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