Question

Question 2: (5.5 marks) 25 mn 1- For the following circuit calculate the currents I, and 12 and sketch the equivalent circuits in the two cases: a-Case 1: diodes D, and Dare ideals (model 1). 1.5 mark R, =6 KO Ro=1 KO E =12V Ry=3K DI b- Case 2: diodes D, and D, are equals to 0.7 V voltage sources (model 2). 1.5 mark

Answer 1

0 Grunen circuit GER R$ 316 lkn Rc Calculate aurrents I and I2"- - diodes D, and B are ideals. from the given circuit D, is on" and ķ is "OFF". Because for at 42 (pritive terminal of lav go Pi is foreward biased connected to positive o terminal of diode) eft (fiktive temeval of tv conmeeted to negative terminal of diode) So ņ is remerge biased reverse

Circuit I GKER - еть . Я { B 36 1 I la Re here at Is it is open circuit So IzzoA for I, 720 6+3 = 1/4 = 1:33 MA I, 1933 mA IR=0A quivalent circuit Rj+p2 =Rer Me qaz V t =1.33 mo 12V7

(b) Case-2% diodes , and as are equal to 0.7V. for the same care also } is off" and D, is "on" (replaced with 0-40) BION" (07V replaced) ş—"OFF" (open ci va b) - Gles R IL A Ý a tv 1 sk & R2 la Rc here open circuit for Iz So (32 30 A) e fol In:- opply loop -12 +6+6) I, +0:7-0 I = 1.25mA IZZO A 11="344 F = 1.25mA Cquivalent circuit in ater Ma 11.25mA 12V