Temperature Alarm Went Off - Lucky Story

By contrast with the conventional device, a reverse-biased Zener diode will exhibit a controlled breakdown and allow the current to keep the voltage across the Zener diode at the Zener voltage. For example, a diode with a Zener breakdown voltage of 3.2 V will exhibit a voltage drop of 3.2 V on the Vout if reverse bias voltage applied across it is more than its Zener voltage. The Zener diode is therefore ideal for applications such as the generation of a reference voltage

You know, Wikipedia is still a source and you should quote things when you take them directly from anywhere. It's a good rule to have.
 
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