Voltage Readings

Discussion in 'Homework Help' started by gunes, Nov 21, 2006.

  1. gunes

    Thread Starter New Member

    Nov 21, 2006
    8
    0
    Another Question,

    [​IMG]

    What will be readings for the 2 voltmeters?

    Waiting for your replies! A.S.A.P

    Regards,
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,136
    1,786
    Hint:
    The total voltage around the loop is 24 Volts
    The total resistance around the loop is 18 K Ohms
    Therefore the current in the loop is 1.333... mA

    Apply Ohms law to each resistor and compute the voltage drop. The three voltage drops should add up to 24. So starting with +12 Volts subtract the voltage drops until you get to -12 volts.

    Are you with me?
     
  3. gunes

    Thread Starter New Member

    Nov 21, 2006
    8
    0
    It does add up to 24 volts, so my next step is subtract the voltage drops starting with +12 volts!

    +12 - 2.67 = 9.33
    +9.33 - 8 = 1.33
    +1.33 -13.33 = -12

    So what do i do next?
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,136
    1,786
    There is no next. The readings on the two voltmeters are:

    Ta Da!

    9.33 VDC
    1.33 VDC

    What more do you want?
     
  5. gunes

    Thread Starter New Member

    Nov 21, 2006
    8
    0
    I see, Thanks alot 4 ur help!;)
     
  6. richbrune

    Senior Member

    Oct 28, 2005
    106
    0
    I got 8.733 for the top voltage meter and .9334 for the second meter, can you see what I did wrong?
     
  7. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,157
    Your IR drop on R1 is off. 2k * 1.33 mA is 2.66 V not 3.66 V
     
  8. richbrune

    Senior Member

    Oct 28, 2005
    106
    0
    Thanks again, Rich
     
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