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CH6Answers

Answers to two page handout (equivalent resistances)...

Answers rounded to two significant digits.

• Figure 6-75: R_T ≈ 31Ω
• Figure 6-76: Left: R_T ≈ 130Ω Right: R_T ≈ 790Ω
• Figure 6-78: R_T ≈ 1.5KΩ
• Figure 6-88: R_T ≈ 3.4KΩ
• Figure 6-90: Left: R_T ≈ 850Ω Right: R_T ≈ 2.8KΩ
• Figure 6-92: R_T ≈ 270KΩ
• Figure 6-95: R_T ≈ 1.6KΩ

Answers to one page handout (pre-superposition)

Answers using 3 significant digits to minimize rounding errors.

1.

    RT = 5.76 KΩ
    IT = I1 = 1.04 mA (to left)
    I2 = 0.50 mA (upward)
    I4 = 0.25 mA (upward)
    I6 = 0.29 mA (upward)

2.

    RT = 3.31 KΩ
    IT = I4
    I2 = 1.10 mA (upward)
    I4 = 3.62 mA (downward) = IT
    I6 = 2.01 mA (upward)

3. We'll do together in class using superposition principle.

Answers to selected book problems...

8.

   VR1= 970mV 
   VR2= 1.1V
   VR3= 1.1V
   VR4= 1.1V
   VR5= 970mV

   IR1= 97mA
   IR2= 32mA
   IR3= 32mA
   IR4= 32mA
   IR5= 97mA

9a.

   VR1= 660mV
   VR2= 590mV
   VR3= 590mV
   VR4= 260mV

   IR1= 12mA
   IR2= 5.9mA
   IR3= 5.9mA
   IR4= 12mA

9b.

   VR1= 2.6V 
   VR2= 420mV
   VR3= 420mV
   VR4= 420mV

   IR1= 3.8mA
   IR2= 620uA
   IR3= 1.3mA
   IR4=  1.9mA

15. The voltmeter presents the least loading across the 22k Ohm load.

16. 31.3V

34.

    a. RT = 853.2 Ohms
       IT = 5.86mA
       I4 = 0.308mA
       P4 = 0.948mW


    b. RT = 2.79k Ohms
       IT = 1.80mA
       I4 = 0.655mA
       P4 = 2.02mW

36. a) RT = 271 Ohms

    b) IT = 221mA
    c) 58.8mA
    d) VB- = 24.2V
       VAB = 12.1V

37. RT = 5.76k Ohms

    VA = 3.3V
    VB = 1.7V
    VC = 850mV
    IT = 3.13mA
    I2 = 1.5mA
    I4 = 0.77mA
    I6 = 0.85mA

39. V1 = 1.61V

    V2 = 6.77V
    V3 = 1.75V
    V4 = 3.33V
    V5 = 378mV
    V6 = 2.57V
    V7 = 378mV
    V8 = 1.72V
    V9 = 1.61V

40. VAB = 3.40V

43. R1 = 180 Ohms

    R2 = 60 Ohms