can anybody solve these question and tell me how you do them Because I know the answers but i dont know how to do them http://imageshack.us/a/img820/1736/circuitu.png
I know I have to say how I tried to do it and failed for the first one I tried many times and I just couldnt get the answer ,the answer for the first question A) is = 300watt and I just dont know how they got 300 for the second question down not B,isA) =-25 B)260 C)16ohmI recommend you read this
http://forum.allaboutcircuits.com/showthread.php?t=3002
You surely had the material in your coursebook already, or were directed to read the material.
For question 2.A, do you know how to find power dissipated by a resistor if you know the current through that resistor? Do you know how to use superposition of current sources? Do you know hot to combine resistors in parallel?I know I have to say how I tried to do it and failed for the first one I tried many times and I just couldnt get the answer ,the answer for the first question A) is = 300watt and I just dont know how they got 300 for the second question down not B,isA) =-25 B)260 C)16ohm
I know how to combine resistors in parallel but I dont really know how to do the superpositionFor question 2.A, do you know how to find power dissipated by a resistor if you know the current through that resistor? Do you know how to use superposition of current sources? Do you know hot to combine resistors in parallel?
You can combine the current sources too since they're in parallel. Glad you solved it.I know how to combine resistors in parallel but I dont really know how to do the superposition
EDITk the first question I know how to solve it now but the second one is just complicated because of the top current the 4A i dont know what to do with it
Yeah thank you,but can you help me solve the other questionYou can combine the current sources too since they're in parallel. Glad you solved it.
It would really help if you would post your attempt at a solution. Then we can determine what you are doing right and where you are going wrong.Yeah thank you,but can you help me solve the other question
well,I tried a lot but they are very bad attempts and i dont know what to do I Just need guidance on how to begin the question and solve it ,please help because Im studying for my retest on this for after 3 days.Thank you for your helpIt would really help if you would post your attempt at a solution. Then we can determine what you are doing right and where you are going wrong.
That makes it all the more useful for you to show it, because it almost guarantees that we will be able to provide useful feedback that is specific to the problems YOU are having.I will tell you what I tried to do but I know this is wrong
If you've seen very many of my posts, you will know that I am a self-professed Units Nazi. If you ALWAYS track your units, you will catch a huge fraction of the errors you make and get valuable hints as to where the problems are. In this case, let's add the units and then examine the equation.I did the node voltage method and got three equations:
1)v1/30 +v1/6 -30+(v1-v2)/25=0
Again, let's track the units:2)(v2+v3)/50 +v2/3.75 -1+(v2-v2)/25=0
Similar observations as above. You need voltage differences across resistors and you need to take the currents in ALL branches leaving a node into account.3)(v3+v2)/50 + v3/20=0
Come up with new equations and post them and let's make sure they are correct before you proceed (but, since there might be a delay in getting feedback from any forum, feel free to proceed anyway to see if you can get the answer).And I know this is wrong but I tried a lot of different ways and still couldnt get the right answer
All I can say to that is, had you shown your work the first time (or after any of the times that you were asked to do so), we could have gotten moving a lot sooner. Not doing so was a choice YOU made....But please people I dont mean to sound douchy or arrogant but please can you help me solve this and tell me how you did it my exam is tomorrow
v2-3.75Ω (don't leave off the units!) has to be wrong because you can't subtract ohms from volts.So for the second equation it would be:
for the first one(v2-v3)/50Ω
for this one it would be v2-3.75(because I did v=i.r so that there would be a voltage there?or should it be just +v2 and I ignore the resistance)/3.75Ω
v2 is a voltage and you can't add it to a bunch of currents! Check your units! Always! Always! ALWAYS!so the second equation should be (v2-v3)/50Ω +v2-1A +(v2-v1)/25Ω=0
DON'T LEAVE OFF THE UNITS!!!!and third one is I think (v3-v2)/50 + v3/20=0
I really don't think that is going to help you. I walked through the first equation term by term and described all of the issues. There are no new issues in the second and third equations and I've pointed out the specific problems in your attempts so far. So just giving you the other two equations will provide you with absolutely nothing that providing you with the first didn't. At some point you have to start paddling for yourself if you are ever to learn how to swim.Hey,I thank you very much for this but is it possible for you to help me with the other two equations because I dont have a lot of time and I have to study the other materials for the test if not I could try to do that but I would really appreciate that if you help me
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