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    Working with Zener diode voltage regulators.

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    Please check my work and if incorrect give me the correct answer

    A shunt regulator utilizes a zener diode whose voltage is 5.1V at a current of 50 ma and whose incremental resistance is 8 ohms. The diode is fed from a supply of 12 V nominal voltage through a 220 ohm resistor. What is the output voltage at no load?
    a. 4.8 V
    b. 4.88 V
    c. 4.96 V
    d. 5.1 V

    V2=6.8
    I2=50mA
    R2=8
    Vt=12
    R=220

    I2=(12-6.8)/(220+8)=5.2/228=22.8
    V0=V20+I2rz
    6.8+.0228*8=5.28

    D is the answer

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    https://brainmass.com/engineering/electrical-engineering/working-zener-diode-voltage-regulators-54727

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    The attachment is the described circuit.

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    Zener problem answered with mathematical formulae and explanations.

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