Search results

  1. T

    Calculate Current, Power, EMS..

    In your second equation, and before you set Vc=0, the last term has R5 in the denominator. If the reference node is the lower right corner, and Vc is active, then R5 shouldn't be in that equation, should it? That means that if you were starting from the correct Vc active equation, you would...
  2. T

    Calculate Current, Power, EMS..

    What do you get when you solve the equations? You should carry more digits in your solution, maybe 6 digits. How are you solving the equations? Are you using a calculator, or a mathematical program like Mathcad? If you don't have those you could use this online calculator...
  3. T

    Calculate Current, Power, EMS..

    He did choose that ground point on my advice. :D The schematic doesn't show the voltmeter which had one end connected to the lower right corner. I think at some point he plans to put the voltmeter back and determine what it would read. I figured he could then note that the voltmeter...
  4. T

    Calculate Current, Power, EMS..

    The thing to do now is to solve the equations and compare the results with the results from the mesh method.
  5. T

    Calculate Current, Power, EMS..

    Label the voltages at the three nodes Va, Vb and Vc.(or perhaps Ua, Ub and Uc). You need 3 equations, one for each node. You must write an equation for the current through each branch that connects to a given node. The current through a branch is equal to the voltage between nodes plus or...
  6. T

    Calculate Current, Power, EMS..

    Here in America, there is no KLC method. There are two Kirchoff laws--the voltage law, "Kirchoff's voltage law", KVL and Kirchoff's current law, KCL. KVL is used in the mesh or loop method. KCL is used in the nodal method.
  7. T

    Calculate Current, Power, EMS..

    Your results look ok, but if you carried more digits you would see that i2 and I3 are not identical, for instance. They are slightly different.
  8. T

    Calculate Current, Power, EMS..

    I'm not sure why you're doing this. In post #6, Laplace pointed out that it's inefficient to give multiple designations to the same current. For example, in this diagram I3 is the same as I03, I2 is the same as I02, et cetera. There's no point is doing this.
  9. T

    Calculate Current, Power, EMS..

    I can't look at the first part for a few hours. I1 = (fi1-fi3+E1)/R1 (assuming I got the signs right) You do the same thing for all the other currents. Take the voltage across the resistor and divide by the resistance of the resistor.
  10. T

    Calculate Current, Power, EMS..

    There doesn't have to be a black dot on the diagram in order to have a node. There is a node between R1 and R5, between E1 and R1, between R01 and E2, et cetera. Your solution in post #7 with the switch open was correct, as far as I could tell.
  11. T

    Calculate Current, Power, EMS..

    For the equations as you have set them up here, I get the same solution. If you want help on a nodal solution. you should add to your diagram some additional details. Let the right end of your voltmeter (bottom right corner of the schematic) be your ground (reference node); show a ground...
  12. T

    AC Circuit Theory Maximum Power Transfer

    You cannot escape using the complex conjugate if you really want the maximum power transfer.. Furthermore, power is only dissipated in the real part of the load impedance.. If the load is represented as an impedance, then the load power is given by the square of the load current times the...
  13. T

    Calculate Current, Power, EMS..

    The only error I see is in red above.
  14. T

    Calculate Current, Power, EMS..

    The voltage shown in red above should be 29.1V, not 21.9V. Even though you have made this error, it appears that you in fact used 29.1V in your calculations. Your calculations seem to be essentially correct, except that, once again, you are not carrying enough digits in your calculations.
  15. T

    Calculate Current, Power, EMS..

    The only thing wrong with your calculations is that you haven't carried enough digits. I get: I1=I5= 2.6939A; I3=I4= 1.6599 A; I6= 4.3537 A These results match up perfectly with the solution by the nodal method if you carry more digits in your calculations.
  16. T

    AC Circuit Theory Maximum Power Transfer

    When there are reactances involved, the load for maximum power transfer is not just Rth; tt's the complex conjugate of Rth. Replace the 50 Hz source with a short and calculate the impedance looking back into the output terminals. The load for maximum power transfer will be the complex...
  17. T

    diode for collapsing magnetic field

    Did we lose Blank Stare?
  18. T

    diode for collapsing magnetic field

    Put an ammeter in place of the burned out diode and see what current is flowing. Maybe use an ammeter that can measure up to 20 amps. Then track down where the current is going. Is it in the green wire going to #30, the relay? Maybe the relay coil is shorted. Is it going through the green...
  19. T

    diode for collapsing magnetic field

    Somehow I get the feeling that response may not be a native speaker of English.
  20. T

    A question about audio output impedance

    It absolutely is a "nominal" value. I have made impedance measurements on a bunch of "identical" transformers, using a high end impedance analyzer, and it's quite typical to see variations in measured impedances of around 10%. There are many variables in the building of transformers, such as...
Top