(c) Figure 2 shows a Wheatstone bridge circuit used in a temperature sensing application. The Wheatstone bridge is balanced with R1 = 10 k2, and R2 = 1925 i. Derive an expression for the ratio of resistances in the balanced con- dition. ii. Find R, if Ry is 1 k? at 25°C. iii. Calculate the bridge's Thévenin voltage and resistance as "seen" at the output terminals vAB for Ry = 10k2, R = 1925 Ra = 1 kf2, R, as calculated above, and V, = 30 V. R1 R3 Vs R2 R4 A B Vout +1)

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(c) Figure 2 shows a Wheatstone bridge circuit used in a temperature sensing
application. The Wheatstone bridge is balanced with R1 = 10 k2, and R2
= 1925
i. Derive an expression for the ratio of resistances in the balanced con-
dition.
ii. Find R, if Rg is 1 kl at 25°C.
ii. Calculate the bridge's Thévenin voltage and resistance as "seen" at the
output terminals vAB for R = 10k2, R2 = 1925
Ry = 1 k2, R4 as calculated
above, and V, = 30 V.
R1
R3
Vs
R2
R4
Vout
Figure 2: Wheatstone bridge
+
Transcribed Image Text:(c) Figure 2 shows a Wheatstone bridge circuit used in a temperature sensing application. The Wheatstone bridge is balanced with R1 = 10 k2, and R2 = 1925 i. Derive an expression for the ratio of resistances in the balanced con- dition. ii. Find R, if Rg is 1 kl at 25°C. ii. Calculate the bridge's Thévenin voltage and resistance as "seen" at the output terminals vAB for R = 10k2, R2 = 1925 Ry = 1 k2, R4 as calculated above, and V, = 30 V. R1 R3 Vs R2 R4 Vout Figure 2: Wheatstone bridge +
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