The unknown resistance Ru in a DC bridge circuit, connected as shown in Fig. 6.4A, is a resistance temperature detector (RTD). The RTD has a resistance of 100 U at 0C and its temperature coefficient...

The unknown resistance Ru in a DC bridge circuit, connected as shown in Fig. 6.4A,

is a resistance temperature detector (RTD). The RTD has a resistance of 100 U at 0C

and its temperature coefficient is þ0.4 U/

C (the resistance increases as the temperature rises). The components of the system have the values: R1 ¼ 100 U,

R2 ¼ R3 ¼ 1K U, Rm ¼ 10K U, and Vi ¼ 9V. What is the output voltage reading

when the temperature is 50C? (Hint: use Eq. 6.10).