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Resistors

Discussion in 'Electronics Homework Help' started by Samuel2100, Sep 14, 2016.

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  1. Samuel2100

    Samuel2100

    1
    0
    Sep 14, 2016
    hey,

    What is the total power loss if 2 k[​IMG] and 1 k[​IMG] parallel-connected resistors have an IT of 3 mA?

    A. 6 [​IMG]W
    B. 36 [​IMG]W
    C. 6 mW
    D. 36 mW

    cheers,

    sam
     
    Last edited: Sep 14, 2016
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    What formulae do you have for calculating power?

    Do you have one involving current and resistance?
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    10,811
    2,438
    Nov 17, 2011
    You have several ways to calculate this, once you have the equations at hand as asked by Steve.
    • calculate the equivalent total resistance and from that the total power using the known current IT
    • calculate the distribution of the total current IT among the parallel resistors, from that calculate power dissipation within each resistor, then add up partial results
     
  4. Colin Mitchell

    Colin Mitchell

    1,417
    313
    Aug 31, 2014
    As you get more advanced, you will know that the current will flow in the two resistors such that twice the current will flow in the 1k resistor.
    But it is much easier to have a big block of chocolate and cut it into 3 pieces. I get twice as much as you.
    This means you can work out in your head, the current through each resistor.
    Now use the formula that states power is . . . . . . . . . . for the 1k and power is: . . . . . for the 2k.
    Then add the two values together.
     
  5. Herschel Peeler

    Herschel Peeler

    401
    65
    Feb 21, 2016
    First find total resistance.
     
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