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what is bleeder current? n how to find it out?

Discussion in 'Electronics Homework Help' started by charmcaster.engg, Jan 16, 2015.

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  1. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    [​IMG]

    If the load in the given circuit is 80 k[​IMG] , what is the bleeder current?
     
  2. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    I find out the total equivalent resistance n then current comes to be 2.1mA. But ans. is 1.96 mA.?
     
  3. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    Which component is the 'bleeder resistor'?
     
  4. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    The current flowing through an unloaded voltage divider is bleeder current.
     
  5. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    It would seem that whoever calculated the answer of 1.96 mA was using a different definition.

    Was the question to find the bleeder current, or find the current through the bleeder resistor?
     
  6. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    I get 1.96mA through R2. I obtained this by first calculating the output voltage. It would then seem that the bleeder current is the wasted current through R2
     
  7. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    Can you explain in detail how you have find out the current? I tried but I didn't get it.
     
  8. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    The question is to find bleeder current. No additional details.
     
  9. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    Find the voltage across RL from the voltage divider between R1 and {R2 in parallel with RL}, then use that voltage to get the current through R2.
     
  10. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    Thanks!
     
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