Skoog/Holler/Crouch Chapter 2 Principles of Instrumental Analysis, 7th ed. 1 2018 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. CHAPTER 2 2-1. (a) Applying the voltage divider equation (2-10) 1 1 2 3 1.0 = 10 + + R R R R 2 1 2 3 4.0 = 10 + + R R R R V 3 = 10.0V – 1.0 V – 4.0 V = 5.0 V 3 1 2 3 5.0 = 10 + + R R R R Dividing the first equation by the second, gives R 1 /R 2 = 1.0/4.0 Similarly, R 2 /R 3 = 4.0/5.0 Letting R 1 = 250 Ω , R 2 = 250 × 4.0 = 1.0 kΩ, and R 3 = 1.0 kΩ × 5.0/4.0 = 1.25 kΩ . Use a 1.0 kΩ resistor and a 250 kΩ resistor in series. The 500 kΩ resistor is not used. (b) V 3 = IR 3 = 10.0 V – 1.0 V – 4.0 V = 5.0 V (c) I = V/( R 1 + R 2 + R 3 ) = 10.0 V/(250 Ω + 1000 Ω + 1250 Ω) = 0.004 A (4.0 mA) (d) P = IV = 0.004 A × 10.0 V = 0.04 W (Equation 2-2) 2-2. (a) From Equation 2-10, V 2 = 15 × 400/(200 + 400 + 2000) = 2.31 V (b) P = 2 2 V /R 2 = (2.31) 2 /400 = 0.013 W (c) Total P = V 2 /R s = (15) 2 /2600 = 0.087 W
11
Embed
Skoog PIA7e IM Ch02 rev2...2-17. Proceeding as in Problem 2-16, the results are in the spreadsheet Proceeding as in Problem 2-16, the results are in the spreadsheet Principles of Instrumental
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Skoog/Holler/Crouch Chapter 2 Principles of Instrumental Analysis, 7th ed.
1
2018 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
CHAPTER 2 2-1. (a) Applying the voltage divider equation (2-10)
1
1 2 3
1.0 = 10 + +
RR R R
2
1 2 3
4.0 = 10 + +
RR R R
V3 = 10.0V – 1.0 V – 4.0 V = 5.0 V
3
1 2 3
5.0 = 10 + +
RR R R
Dividing the first equation by the second, gives
R1/R2 = 1.0/4.0
Similarly, R2/R3 = 4.0/5.0
Letting R1 = 250 Ω , R2 = 250 × 4.0 = 1.0 kΩ,
and R3 = 1.0 kΩ × 5.0/4.0 = 1.25 kΩ . Use a 1.0 kΩ resistor and a 250 kΩ resistor in