Transient Response of Electrical Network

  • Thread starter jaus tail
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Homework Statement


upload_2018-1-24_12-11-37.png


Homework Equations


In Capacitance current leads voltage
In Inductance current lags voltage
For oscillations R = 0

3. The Attempt at a Solution

Since current is leading voltage in above question, impedance is capacitive.
Book answer is D for both.
How?

And for 3rd question, should R be 0, else circuit is damped. Oscillations mean undamped system so R = 0.
 

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  • #2
BvU
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And for 3rd question, should R be 0, else circuit is damped
No. Transient (damped) oscillations are also oscillations.
 
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  • #3
BvU
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Two for the price of one ? What is the complex impedance ##Z## in exercise 2 ?
 
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z = v / i = 200 sin (2000t +50) / 4 cos (2000t + 11.32)
= 50 sin (2000t + 50) / sin (2000t + 11.32 + 90) = 50 sin (2000t + 50) / sin (2000t + 101.32)
For this to be resistance the phase angle must be zero which doesn't happen. So I think D cannot be right answer. Resistance cannot vary with time so the sine term must be a constant and not a time variant.
 
  • #5
BvU
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I agree there must be something wrong with the book answer for exercise 2.
 
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