Calculate capacitor voltage
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter6: Power Flows
Section: Chapter Questions
Problem 6.27P
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Question
- The expression for capacitor voltage in an RC circuit (assuming no initial charge) when DC voltage is applied is ??(?) =?s (1 - ?− (t ⁄??) ) Assume Vs = 10 V, C = 50 ??, and R = 100 . Calculate capacitor voltage when t = :
1*RC _____ 5*RC _______ 10*RC ______
2. The voltage across an inductor when a DC voltage is switched on is ?? (?)
??− ( t ⁄ ?⁄? ). Assume Vs = 10 V, L = 1 mH, and R = 1 Ohm. Find the voltage across the capacitor at t = :
0 ms __________ 1 ms __________ 10 ms __________
- Derivation: Consider the equation for ? : ?? = √(1⁄??) − (?⁄2?)2
Oscillation will occur only when this expression is a real number (not an imaginary number). Solving, we see that the expression is a real number when (1 ⁄??)> (?⁄ 2? )2. If C = 0.01 uF capacitance and L = 10 mH, what
is the largest value of R for this condition to be true?
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