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voltage across 2 terminals of diode,transistor


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It shows that the diode or transistor's junction is working properly.
When it is forward biased and conducts, then the voltage is about 0.7V and when it is reverse-biased, then it doesn't conduct. The forward voltage changes a little with current and with temperature. When it is very hot then it conducts a little leakage current when reversed biased.

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