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Zener diode.

What is the voltage drop across a 3v, 0.5W Zener diode?

AndyGadget3 years ago
 
When it's forward biassed it will be just like a normal diode - around 0.7V.
When it's reverse biassed it will be 3V, as your question suggests.
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+1
Zener diodes like resistors have a tolerance variability.