Electrical Engineering: Ch 11 AC Circuit Analysis (5 of 55) Mesh Analysis Example

In this video I will show the 2nd, mesh analysis, of the 6 methods by adding the voltages going around each mesh or loops using Kirchhoff's voltage loop analysis method to find I1=? and I2=? of a circuit with a current source, voltage source, resistor, capacitor, inductor, and a single node.

Next video in this series can be seen at:

[jamesbarth]

Thank you so much for your time, the longer I'm in school the more I realize what an amazing teacher you are.
I hope that I'll be as competent if I teach one day.

[Jnglfvr]

BY inspection the current I1 = 5<10. The current through the inductor is I1 - I2. You're right that you don't know the voltage drop across the current source but you don't need to because I1 is manifestly already equal to 5<10. You then do the loop #2 substituting 5<10 for I1 and solving the single unknown I2. And that's how it's done.

[AR_BSME]

Hello sir. from previous video 4/55 using nodal we found (V=54.7 -10.7i)
Using the value of I2 I used this relation. ( I2= (V-10<60)/3-4i ) then I tried to solve for V.
my value of V came out to ( 54.5+6.7i)

Why is it I cant solve for for V this way, or is the another potion I missed. Thank you.

Only reason ive been surviving this last few years of Egn school is due to you.
I made it trough physics 1 and 2 solely on your video series

[karuniyageorge]

Hi, why is I1 = I from the source? Wouldn't the current I divide into both the first loop and the second loop? Some of the current from current source would be a part of current I2, or am I thinking wrong here? How?

[siangetz]

Why is the current source ignored in the first loop? In my classes, they also include that, which adds the term "5<10(degrees)" to the equation. Otherwise, great lecture, professor. :)

[canpolatguleryuz]

I love how his intro sounds like Borat

[creativeedge]

I have a question D.r Michel
in the equation number 2
if we substitute 1 in 2 we found I2=-2(cos(6.87)-jsin(6.87))
thank you a lot

[vaibhavgiria]

sir shouldn't the current i1 be 5<10' becuase its a current source which is directly given
hence we don't require its equation
love your work <3 watched all of your previous vids

[vanelp]

Is it possible to get I2 from the first equation: -j8(I1-I2)=0 knowing that I1=I? I've been trying to solve it this way but the result is different...maybe I'm doing something wrong...

In any case, THANK YOU!

[yahyaomarjee]

I'm trying to work out I2 from the first equation but i just don't seem to be getting the same answer as I2 calculated using the second eq

[hakimalhasan]

How can u find the value of i1 plz explaine it sir

[hakimalhasan]

Why you put is=i1 sir, plz explaine it ..

[codebnder]

Sir, from equation 1 j8 cant be 0, so (i1-i2) must be 0, so why not i1=i2?

[nayimaurooj]

Sir, How come you manage to solve these problems..I try alot but I get confused.Can i have a tip?

[adamscheuring]

My professor taught us mesh such it should just be j8 and not -j8. You can arbitrarily assign polarities, and the current "hits" the + sign of the inductor first, so the equation would be j8(I1 - I2). He has a PhD so I assume he knows what he's talking about but it seems to be at odds with how you do it. Yet you both seem to consistently get the correct answers so I'm pretty confused.

[lorenmaebulaybulay]

why is it-5<53.13? i tried in the calc I get 5<-126.86 from -3-j4, please help sir. thank you

[BentHestad]

Thanks for great series! I wonder a bit though, current source in parallell with inductor, with 50 V on top and 0V on bottom, so it must have a voltagedifference of this size itself, like the inductor??

[ahmadeldesokey]

Sir, how to know that the direction of assumed current in ac analysis is wrong ?

[Chan-uxej]

Hello Professor Biezen, I have been solving circuit problems from my book similar to this lecture, and I had a question with regard to the phase angle. For your I2, you have gotten 9.90 at an angle of 50.85 Amps. If I were to translate this to my book, I would sometimes get the phase angle 180 degrees out of phase, making the 50.85 a -123.15 or 230.85. Is this still a correct phase angle or is this incorrect?

[arunbandari]

Sir how can we solve simultaneous equations in complex variables using calculator