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What would happen if an ideal voltage source (i.e. no internal resistance) was connected directly across a diode in the forward bias direction? For a real silicon diode the knee voltage is about 0.7V and the diode's internal resistance can drop roughly another 0.3V before overloading. If the voltage source applied more than the sum of the knee voltage and the maximum voltage the internal resistance can drop before overloading (this sum is roughly 1V) then bad things will happen.

You should have been able to figure out you answer yourself from the above. The situation above is only trivially changed by the use of a real voltage source (i.e. having internal resistance), it only postpones the overload a little.

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10y ago

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