Current source breaks conservation of energy

Discussion in 'Feedback and Suggestions' started by crosbis2, Oct 14, 2009.

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  1. crosbis2

    Thread Starter Guest

    A photodiode is often described as a current source in photovoltaic mode. the formula for developing a voltage across a photodiode diode is V = S. P . R
    V= v out
    S= photodidoe responsivity with wavelength
    P= laser/ light power
    R= load resistor

    What i can't understand is placing a 10k resistor as R instead of a 1k resistor will give me a 10 times increase in voltage. so for the same input light intensity I've just increased my output voltage.........great- but doesn't it violate conservation of energy, where is the catch?
  2. Dave

    Retired Moderator

    Nov 17, 2003
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