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The rule of thumb is that when a diode is fully on, it looks like a short circuit (ideally). So (to make this easy), say I have 100 V source and a diode which breaks down at 10V. If my power supply/source impedance is 1 Ohm, will the current through my diode be:

  1. I = (Vsupply - Vdiode)/Rsupply = (100 - 10)/1 = 90/1 = 90 Amps, or
  2. I = Vsupply/Rsupply = 100/1 = 100 Amps?
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  • \$\begingroup\$ What is the question? \$\endgroup\$ – AndrejaKo Feb 3 '11 at 17:04
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The current will be the same for all parts of the circuit, and in this case be about 90A as the diode can be considered to be a low resistance 10V drop.

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