Finding Iz and Is for VZ = 7.2V with RL = 10Ω

[go2255]

I don't know how can i find the Iz and Is.

The zener voltage VZ = 7.2V, with the condition that the zener current 77mA ≤ iZ ≤ 1A
load resistance RL = 10Ω.
What is resistance RS when load voltage VL is regulated to 7.2V while the input voltage Vin varies by ±10% from its nominal value of 12V. Also check that the zener current iZ is larger than 77mA at lowest input voltage Vin .

 

[NascentOxygen]

Redraw the circuit for Vin = 12V - 10%, this time marking on every parameter you know. Post that labelled schematic.

 

[George H]

Is this HW?
IL = Vz/RL
Is = Iz +IL
Rs = (Vin - Vz)/Is

George H.