PROBLEMS ANSWERS:
1. At 0° C, resistance = 264 ȍ; at 60° C, resistance = 336 ȍ
2. At -50° C, voltage = –2.43 V; at 320° C, voltage = 17.43 V
3. ǻR/R = GF * fractional change in length called as strain = 0.0005 * 2.1 = 0.00105;
ǻR = 115 ȍ * 0.00105 = 0.12075 ȍ, so the original resistance is (115 + 0.12075) =
115.12075 ȍ
CHAPTER 6
QUIZ ANSWERS:
1. cup electrodes
2. b) The smallest change in the output detectable
3. b) -1.2 V
4. d) 3.33 V
6. Cell voltage = –kT/Q * ln(2 * 10–6 * 140 + 2.2 * 10–8 * 20)/(2 * 10–6 *10 + 2.2 * 10–8 *
160); where k = 1.38 * 10–23 joules/kelvin, T = 38 + 273 = 311 kelvin, Q = 1.602 * 10–19
coulomb
7. Determine R4 first when the bridge is balanced. R4 = (R2 * R3)/R1; Then use R4= 375
ȍ = 400 * (1 + 0.004(T – 22)) and compute T.
Later, determine R4 when the bridge is unbalanced with R1, R2, and R3 having the same
previous values. Now, determine temperature T.
Students should research the answers to Problems 8–10 on their own.