Zener Diode As Voltage Regulator

A car stereo working at stabilized voltage supply of 9V DC and has a Zener diode of 9V , 0.25 W . But the voltage supply inside the car is 12 V DC . The boy approached you to get help . a. Which mode of bias will you suggest to connect Zener diode as voltage regulator ? b. Draw a circuit diagram of voltage regulation to help the boy . c . Which device is essential for circuit diagram ? Find the value of that device . [ Hint . Current through the load , I_(L) = 0 ]

Explain zener diode as votltage regulator .

Explain the use of Zener diode as a voltage regulator.

Explain the working of a zener diode as a voltage regulator.

Explain the use Zener diode as a voltage regulator.

What kind of biasing is required to use a Zener diode as a voltage regulator ?