Question

Problem 2 (8 pts): Determine the current in each branch of the circuit shown in Figure below (2pts) (a) Write the two general rules of Kirchho f. (b) Write the three equations that determine these currents (4pts) (2pts) (c) What does it mean if the value for a current turns out to be negative? Ri 60 www R2-20 VI-9V- R-9 V2-3V ww R4-50 Equation 1: Equation 2 Equation 3: ..., ...I2+. ...I3= I+ +.. I,+. I2+ ...l3

Answer 1

Solution: (a) Tuo laws of Kimchoft are ) Kincheffis Cuwoeut law (KCL) The total cuoorant entening jmeken must be equal to total curant the junchon (eaving i) Kixchaf's Valfage law (kVL) tpotential difernce lcop o all componenta The Sum acxoss a is Zeno

Uaing mect at tdiagram, KCL at junction whore R, LR have, we I, I- sing kVL in left lp diagam, 9- 6I, t 2 I2 3 O 6I,-21 = 6 33 31, I (2 3 I, I2 Using kvL in night loopf diagram 3- 2 T2-9I3 -5I3 = 3 2 T2 1I3 - 0 212 I3 = 3

value fox tueins out to be cworant negatve the disection Cusorent is Means actual 악peit 아 the assumed disnection Equation Epuation 21 31,-I2 3 Equa tion 3: 3 2I 13 -1 I3 O 1 I, 1 I, 3 I, 1 1, OI 3 2 I 14 1 으피