Please show all work and to follow directions. Only answer Problem
14
Solution :
Q9.
Here, Total resistance seen by the 200 v voltage source will be the equivalent resistance between A and B. And the current flowing through the Equivalent resistance will be Ix [ As 20 ohm is in series with the resistance ].
So, Resistance Between A,B = RAB = 20 + { 40 || (50+70) } = 20 + { 40 || (120) } = 20 + 40*120/(40+120) = 20 + 30 = 50 Ohm.
[ As, 50 and 70 ohm are in series with each other and 40 ohm is parallel ( represented by ' || ' symbol ) with them and finally 20 ohm is in series with the whole circuit. ]
So, Ix will be 200/50 A = 4 A. [ As per ohm's law, V = I* R. or, I(current ) = V(voltage) / R(resistance) ].
Here, Current flows through Ix = 4 A, and in divided in 2 , one go to the 40 ohm resister and the other to the 50 series 70 = 120 ohm resistor.
By, Current divisor rule, Iy will be,
Source Current * { Resistance of the opposite lane / (Resistance of the opposite lane + Resistance of the same lane) }
= 4 A * { 40 / (40+120) } = 4 A * 40 / 160 = 1 A.
So, Answer
a. 50 ohm.
b. 4 A.
c. 1 A.
Q.10.
Using Source transformation,
So, We converted v1 to i1, where i1 = v1/r1 = 200/20 = 10 A,
next we find R1 and R3 parallel, that makes 13.333 ohm in equivalent as Rx.
Now, we convert I1 to V1, where V1 = I1 * Rx = 133.333 V
Now, Rx , R2 and R4 are in series makes 133.333 ohm equivalent as Ry.
Now Current through Ry = V1 / Ry = 133.33/133.33 = 1 A.
Which is same as Iy.
Q11.
Mesh Analysis,
KVL in Loop Y,
0 = (40+50+70)*Iy - 40*Ix
or, 40*Ix = 160 Iy
or, Ix = 4 * Iy ....................................eq.1
KVL in Loop X,
200 = Ix*(20+40) - Iy*40
or, 200 = 60 * Ix - 40* Iy
Putting eq. 1 to action,
or, 200 = 60* 4 *Iy - 40*Iy
or, 200 = 240 *Iy - 40* Iy
or, 200 = 200 Iy
Or, Iy = 1 A
Putting value in eq.1
Ix = 4*Iy = 4*1 = 4 A.
Q.12.
Nodal Analysis,
Here,
Applying KCL at node B,
I1 + I2 + I3 = 0
Or. (Va - Vb)/20 + (Vd - Vb) / 40 + (Vd - Vb) / (50+70) = 0
We know, Va = 200 V, Vd = 0 V
Or, (200-vb) / 20 + (-Vb/40) + (-Vb) / 120 = 0
Or, 10 -( vb / 20) + (-Vb/40) + (-Vb) / 120 = 0
Or, 10 - Vb / 12 = 0
Or, Vb = 120 V.
So, I3 = (0-120) / (50+70) = -1 A
So, Vc = Voltage across C to D = -1 * 70*-1 = +70 Volts.
Iy = - I3 here,( opposite direction) = +1 A
Ix = I1 = (Va - Vb )/ 20 = (200 - 120) /20 = 80/20 A = 4 A
Simulation,
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