I'm suppose to calculate the voltages across the diodes.. but I was wondering in this situation, are both diodes conducting, or is only the first one conducting because there is more power in that, and it shuts off the other one.
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in diode problems like this usually, you should check all cases to see which is the only consistent one. In this case, there are four cases both off, both on, D1 on only and D2 on only. Now I am not sure whether those diodes are ideal or you put 0.6V across them when they are ON. But the technique is the same. Remember what determines ON/OFF is the potential difference across each of them.
lol, its kind of a long explanation.. but even if the 5V turned on much before the 8 V did... but as soon as the 8V kicks in, there is 7.2 volts against the 5 volts.. and so it doesn't go through the diode.. I know its more complicated than that. but...