voltmeter

Discussion in 'Homework Help' started by akifnadeem, Nov 6, 2010.

  1. akifnadeem

    Thread Starter Member

    Apr 9, 2010
    15
    0
    A 2 k-ohm resistor is connected in series with a 4 k-ohm resistor and a 1.5 V battery of negligible
    internal resistance. Calculate the voltages across the two resistors. Calculate the voltages
    measured across the two resistors by a voltmeter with an internal resistance of 2k-ohm.?
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Don't expect the solution. Show your work as someone can help you.
     
  3. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
  4. akifnadeem

    Thread Starter Member

    Apr 9, 2010
    15
    0
    i know what you want to say...!! i know voltage divider rule, but point is: when you measure voltage using voltmeter, you get the different answer. Just tell me the procedure how to figure it out. please show me the method, i know that there is internal resistance, but how does it come out different,mathematically.
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    The internal resistance of the voltmeter is calculated in parallel with the resistor which the voltage is measured across.
     
  6. akifnadeem

    Thread Starter Member

    Apr 9, 2010
    15
    0
    sir, kindly solve the numerical-problem that i posted, and please show me the method, that how would you get the answer.
     
  7. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,386
    497
    You have three circuits here. First you solve circuit in Figure 1.

    Then you solve the other two circuits.
     
  8. akifnadeem

    Thread Starter Member

    Apr 9, 2010
    15
    0
    thanx man...!!
     
  9. johncurran94

    New Member

    Nov 10, 2010
    4
    0
    I =1,5volts/6k
    therefore voltage across 4k is 1.5volt*4k/6k and voltage across 2k is
    1.5 volt*2k/6k the voltmeter should not have internal resistance of 2k unless this is a quiz
     
Loading...