Cramster.com - Homework Solutions, Lecture Notes, Exams, and Free Online Homework Help
Sign Up Now! Login Customer Support Cramster Blog
McAfee Secure sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams
Problem Solved.
    Home    
    Homework Help    
   Answer Board   
    Resources (Beta)    
   
You Are Here: Home > Answer Board > Electrical Engineering > Topic: Phasors and Practical Impedances
Member's Topic Headline:

Phasors and Practical Impedances

Know the answer? Have a better solution? Share it.
Get Help Now.
View homework problems
explained for free!
Member Testimonials

Question:

Advertisement:
Answer | Ask New Question | Customize Profile | Leaderboards | 
FAQ

Member's Avatar
Pupil
Karma Points: 50
Respect (0%):
Date Posted: 7/21/2008 11:45:01 PM  Status: Live
Phasors and Practical Impedances
Course Textbook Chapter Problem
N/A N/A N/A N/A
Question Details:

Capacitors and inductors have been shown as ideal elements with impedances: ZC and ZL

Z(L) = V(L)/I(L) = jωL  & Z(C) = V(C)/I(C)= 1/jωC
A more practical mode of these components is shown in the figure below
a) Find the impedances of the practical components described by the figure. Compare
with the ideal impedances above.

b) Sketch the (magnitude only) Bode plot (plot of 20 log(||Z(jω)||) .vs. log(ω)) of the
ideal and practical components. Use as values for the parameters:
L = 0.08[H], R = 0.1[Ω], C = 0.1[μF], R1 = 1[MΩ].

Answers:

Cramster Expert

Member's Avatar
(Cramster SME)
Cramster In-House Subject Matter Expert
Date Posted: 7/22/2008 3:37:22 AM  Status: Live
Asker's Rating: None Provided    Moderator's Rating: N/A
Response:
 a)        
                  
 
        As the practical inductor contains a resistor and inductor in series. The ideal inductor contains only imaginary part where as practical inductor contains both real and imaginary.
                        ( Practical )
                              ( Ideal )
 
                  
 
         The practical capacitor contains a resistor and capacitor  in parallel. The ideal capacitor contains only imaginary part where as practical capacitor contains both real and imaginary.
               
                        ( Practical )
                                ( Ideal )
   b)
         Substitute values of R , L , C , R1
               
         Magnitude
                                                       ( Ideal )
                                 ( Practical )
         Magnitude
               
                                                 ( Ideal )
                                               ( Practical )
 
         By the magnitude equations we can sketch the bode plot by taking the logarithm of given magnitude values.
 
 
 
 
Hope this helps you.............



By reading or posting messages on these forums, you are agreeing to the Answer Board's Terms of Service and Conduct (TSC).


About Cramster | Terms of Use | Privacy Policy | Contact Us | Press Room | Site Map | Support | Anti-Cheating Policy

Cramster.com is not affiliated with any publisher. Book covers, title and author names appear for reference only.
Copyright © 2008 Cramster, Inc.