Electrical Engineering 40 - Fall 2000 - Oldham - Midterm 1

# Electrical Engineering 40 - Fall 2000 - Oldham - Midterm 1...

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Unformatted text preview: W What is the value of the unknown node voltage in each of the following circuits? Assume diodes are perfect rec- tifiers. ‘ ' L (a) (b) . .. (c) Is R = T for all possible inputs? it (WARNING: You must fill out truth tables in this problem to receive credit.) \, 1of16r (b)' Find xix; ' ' (¢) Find powerdeliivé’ikfedibyythe‘vcltageasourcéf' ‘g - r) 4 l . i I ' For the circui-tbelow: (a) Identify known and unknoWn node voltages, and _ (b) Write sufﬁCient nodal equatiOns .to Solvofor the unknown node voltages (do not solve). I 7(a.1)kknoWn node voltages: Va. 3: . ‘Vg, : V65 (3.2) unknown node-Voltages: r Nodal Equations: L Sons giinoagl: glam writ: éqﬁﬁtigqnsr'to. ﬁnd: V3, _ - ,g/r'y'f‘i 55-:jdf16 a Vc E" z 5K _1p1= t-= 0 (initially + 8K uncharged) \ For the circuit above, the capacitor is_initially uncharged. The switch closes at t = 0 . (a) Find VC fort: 0+ and t—)oe, . I Smce KM};th We Calmch l3 Uﬂdﬂqlgag) \lc (0'5 = O\( ' at M .9“ Valley ck We (+3 side vat—m): éV r3 8V5, €er 44% (-3 SH? O\C ' , Capacik VoH<33 {3 av) ,2) VC; 9,1: 6V (b) Sketch (very’neatly and accurately!) VC vs. t on the graph below. You must label the axes. CW Vc(t = 0+) = ._.————— (e) Write an equation tot VC(t). L L r vca) = é ,_ é 6’ V7. EX = R2163 Ceq, 5 ‘ R91 : gm " V0 6 games ‘ ghocl 90f16 owl” C ,. 81 be 2): ((\$59on _ In the lab 6n the ipulse; ’Trespgn;¢_5rqf gingham ' r lo-V‘higheilmnslons , ,, You MOW-R r is 2K9: What’isthé 931m ofc '2‘ I, for +14», 'r:s~ftk‘3 j i’ ’ out/pf pug; I . _ , \$ ‘ . , * 7"6/ﬂcg, , -\/4é‘):*/0[/’ a], ). § N --€ "/¢>0??5, - V’KMdKSJfS’v. Ice“. ,*yl'00x1rok'q/zooo’c,)i_ - 5§? [/ "“€_ , “ » 11 ONE I You measuré thé ‘a circuit in‘ a"‘bIack 56x” in the lab. '“?alllllllllllllllf «Illllllllllzall Illllllll!illll;. g Illlllllilllllla *§IIIIl!iIIIIIIII Illzallllllllll Ilillllllllllll- IIIIlIIlIllIIII _ Volts « __ , What is a possible circuitthat'is in the box? Draw here ¢ . _ '1'3ot1sr ' * , . _‘ . :, ' Z L I oz, : [h : ’* 7 w I ' j ; , , 14°F” Emma”;”_ I In this expedment'; you “peek,” i.e._, you Open the box before testing it. You see the following cirwit: What will be the I-V graph you; will measure for this cirotiit? (You must label axes for credit.) I I _w llIIIllIIIIIIII Illlgllllllllll. .lllllllllllllll _A¢IIIIEIIIIMIIIII t Illlilllﬂllllll *IIIIIIIIIIIIIII . Illllllllllllll_+ Ill-onullllllll. i_ Volts- v 150f16‘ _ -»_ :4 5 :. L ,Hme’ I,v. curve, , -_ aénd‘ Is: I, Voltage.) S‘inﬁe- -, "1”:30 )‘ v5, = v“ v; :- *:.?-M 3v _ 1:. 2 your. ‘ “ '2M4IM m 16 of1'6 ...
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Electrical Engineering 40 - Fall 2000 - Oldham - Midterm 1...

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