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Hey guys please help me solve these questions (Electrical(electronics) Engineering)

  1. May 26, 2008 #1
    Hey guys please help me solve these questions !!(Electrical(electronics) Engineering)

    ok guys, I was on a vacation, and when I came back the professor just handed out an assignment, and I have no clue about it !!!

    Please please, I really need your help on this. The assignment is due on the 28th !! Please I beg you to solve this for me !

    I came back late, so I only have 2 days for it, as the rest of the class had the whole week ! pleaseeeeeeeeee i really need your help!





    these are the questions :



    Q1) Find the equivalent resistance at terminals A-B in the circuit.

    [​IMG]





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    Q2) Find the voltage across and charge on each capacitor for the network below :

    [​IMG]




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    Q3) State and prove the law :-

    e=Ndφ/dt



    --------------------------------------------------------------------------------





    Q4) Find Vo in the network :

    [​IMG]




    -------------------------------------------------------------------------------




    Q5) A factory has a 240-V supply from which the following loads are taken :

    Lightning: Three hundred 150kW, four hundred 100W, and five hundred 60W lamps.

    Heating : 100kW
    Motors : A total of 44.76kW with an average efficiency of 75%

    Misc. : Various loads taking a current of 40A


    Assuming that the lightning load is on for a period of 4 hours a day, the heating for 10 hours a day, and the remaining for 2 hours a day.

    Calculate the weekly consumption of the factory in Kwh when working on a 5 day week.




    ---------------------------------------------------------------------------



    Q6) Use Mesh equations to find the current through 10 Ohm resistors.


    [​IMG]
     
  2. jcsd
  3. May 26, 2008 #2
    Come on, try and make an attempt.

    Q1. Use the formulas for getting the total resistance of resistors in series and resistors in parallel separately.
    Q2. Learn how to calculate total capacitance of capacitors in parallel
    Q3. Read up on electromagnetic induction
    Q4. Same principles as question 1.
    Q5. Read up on Ohm's law and Coulomb's Law.
    Q6. Read up on mesh analysis.

    You have enough time to learn this in two days trust me.
     
    Last edited: May 26, 2008
  4. May 27, 2008 #3
    well I have solved Q no.1 and Q no.4, but I am STRUGGLING with the rest, pleaaase help :(
     
  5. May 27, 2008 #4

    cristo

    User Avatar
    Staff Emeritus
    Science Advisor

    Please read the forum rules: you need to show some work before we can help you with homework questions.
     
  6. May 27, 2008 #5
    Qno.1)
    the 3 kOhm + 6 kOhm = 9 kOhm, which is in parallel with the 18 kOhm resistor. 1/R = 1/18 + 1/9. R = 6 kOhm. So, overall, that part has 6 kOhms in resistance. adding the other two resistors that are in series, 6 + 6 + 10 = 22 kOhm. the equivalent resistance is 22 kOhms.


    Also Q no,3 I got help from wikipedia and ive got that done now.

    So I onlyneed help with Q no.2,5 and 6.
     
  7. May 27, 2008 #6
    trust me bro, I would have solved the other ones if I could but I cant. Its not that I am not investing time into studying and solving them myself, its that I dont have anymore time !

    The Mesh equation question is totally out of knowledge, since he taught that while I was gona and gave this assignment.

    I really need the marks on this assignment, since ive been a little off in this course.

    I really need help please.
     
  8. May 27, 2008 #7

    Defennder

    User Avatar
    Homework Helper

  9. May 28, 2008 #8
    thanks for the help guys, I solved all of them, but im not sure if I got Q no.5 right
     
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