Average Forward Current

Discussion in 'Homework Help' started by wtfman, Oct 11, 2011.

  1. wtfman

    Thread Starter New Member

    Oct 7, 2011
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    My try for this solution:

    Since its asking for the current through the diode only and it is silicon:

    Id1 = .7v/200 ohms
    = .0035 A

    i was thinking of the Idi as 50-.7/ 200 ohms = .2465. but that would be for the resistor right?

    Just trying to confirm

    Thx
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    The second answer of 0.2465A is OK. Not sure where you were going with the first idea - definitely not correct.
     
  3. wtfman

    Thread Starter New Member

    Oct 7, 2011
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    then what would the current be across the resistor
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    It's a simple series circuit - What do you know about the current in each component of a series circuit?
     
  5. wtfman

    Thread Starter New Member

    Oct 7, 2011
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    its the same
     
  6. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    So how would you answer your own question in post #3?
     
  7. wtfman

    Thread Starter New Member

    Oct 7, 2011
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    just trying to make sure.
     
  8. Adjuster

    Well-Known Member

    Dec 26, 2010
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    It is much better to say the current through the resistor. What appears across a resistor is a potential difference, or more loosely a volt-drop or a voltage.

    If you remember "Voltage across, current through." you will be less likely to get confused by this sort of problem. You may also avoid the possibly expensive and hazardous mistake of connecting an ammeter across a supply.
     
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