52 Midterm x
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2102210 CIRCUIT THEORY 1, First Semester, Midterm Examination, July 24, 2009. Time 13:00-16:00
1. จงหาคาแรงดนปม Va, Vb, Vc โดยวธโนด (Nodal Analysis) ของวงจรตอไปน (10 คะแนน)
( )VVVVVV cba 667.5,778.2,33.38 ===
2. From the circuit shown below, use Mesh Analysis to find the value of iX, vX and power delivered by each dependent source. (10 points)
( )WPWPVvAi
XX viXX 473.0,29.4,12.1,46.0 22 ====
3. จงวเคราะหหาแรงดน ov โดยใชทฤษฎการทบซอน 10 คะแนน)
( Vvo 36= )
4. 1 Determine the thevenin equivalent circuit at terminal a and b (3 points)
(Voc=8 Volt, Rth=1 kΩ)
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4.2 Determine the thevenin equivalent circuit at terminal a and b (3 points)
(Rth=0.4 kΩ)
4.3 Find RL which absorbs the maximum power and also the maximum power at RL. (4 points)
(RL= 4 kΩ, Pmax= 4 mW)
5. At t = 0 s, switch S1 opened and switch S2 closed. Find vy(t) when t > 0 s. (10 points)
( )( )stWhenVetv ty 03 5000 >= −
6. กาหนดใหสวตชในวงจรขางลางปดอยเปนเวลานานกอนทจะถกเปดออก ณ เวลา t = 0 จงวเคราะหหากระแส ix สาหรบ t > 0 (10 คะแนน)
tcx e
dtdvCti 253)( −−== mA, 0>t