Diode work

Discussion in 'Homework Help' started by beemovie, Dec 29, 2008.

  1. beemovie

    Thread Starter Member

    Dec 19, 2008
    12
    0
    Hi !!!
    first of all best wishes, Today I have encountered a h.w question which I cannot understand.Please help me out through this. If you can please when you answer write the question number so that I han recognise to which one you're refering.I am still a Beginner.10x
    ----------------------------------------------------------------
    The diode is silicon in the diagram. Using the second approximation method calculate :
    1) The load voltage
    2) The diode voltage
    3) The diode current
    4) The diode power
    5) The load power

    HELP ME !!!!

    thankyou for now
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,641
    2,344
    Hello,

    To solve the question you will need the properties of the diode.

    [​IMG]

    What is the voltage across the diode ?
    When you know this the voltage across the resistor can be calculated and its current.

    Greetings,
    Bertus
     
  3. beemovie

    Thread Starter Member

    Dec 19, 2008
    12
    0
    I still cannot understand it well !!
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,641
    2,344
    Hello,

    You must know the properties of the diode to get an answer.
    It is said it is an silicon diode, I think the forward voltage will be around 0.7 Volts.

    Now calculate the voltage accross the resistor, then you can calculate the current and the powers.

    Greetings,
    Bertus
     
  5. beemovie

    Thread Starter Member

    Dec 19, 2008
    12
    0
    Hello

    First of thanks for your help Bertus....
    I will try to solve this out !! I need to someone confirm it please!!!And help me through 4,5 suggest me which calculations I have to use

    1)the load voltage...... V= 10-5=5V
    2)The diode voltage......Considering it is a silicon diode it is 0.7v
    3)The diode current.....I=V/R.. I=0.7/1000= 0.0007mA
    4)The diode power==??????????
    5)The load power=?????????
     
  6. bertus

    Administrator

    Apr 5, 2008
    15,641
    2,344
    Hello,

    That is not completely correct.
    There will be about 0.7 Volts across the diode, this has to be subtracted from the 5 Volt you calculated.

    Greetings,
    Bertus
     
  7. beemovie

    Thread Starter Member

    Dec 19, 2008
    12
    0
    I'll try it again please confirm it for me and someone help me through 4 and 5
    1)the load voltage...... V= 10-5=5V
    2)The diode voltage......Considering it is a silicon diode it is 0.7v
    3)The diode current.....I=V/R.. I=4.3/1000= 0.0043mA
    4)The diode power==??????????
    5)The load power=?????????
     
  8. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    Watch your unit. Volt divided by R gives Ampere, not milliAmpere.
     
  9. bertus

    Administrator

    Apr 5, 2008
    15,641
    2,344
    Hello,

    You are still giong wrong.
    1) The load voltage : Utop - Ubottom - Udiode = 10 - 5 - 0.7 = 4.3 Volts
    2) The diode voltage : Considering it is a silicon diode it is 0.7v
    3) The diode current : Uload / Rload = 4.3 / 1000 = 4.3 mA
    4) Power current : Udiode * Idiode
    5) Power Load : Uload * I load

    Now continue.

    Greetings,
    Bertus
     
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