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Explain the use Zener diode as a voltage...

Explain the use Zener diode as a voltage regulator.

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The circuit connections are made as shown in the figure. The circuit contains a zener diode, an unregulated voltage source (`V_"in" > V_Z`), a series resistance `R_S` and a load resistance `R_L`. Any increase/decrease of voltage drop across `R_S` produce no change in voltage across the zener diode. For (`V_"in" < V_Z`), the zener diode does not function. Thus the zener diode acts as voltage regulator.
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