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Power electronics and drives miscellaneous

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Power electronics and drives miscellaneous
  1. The circuit in the figure shows zener regulated dc power supply. The zener diode is ideal. The minimum value of RL down to which the output voltage remain constant, is ______ Ω .
    1. 15
    2. -45
    3. 45
    4. 90
Correct Option: C

I =
24 - 15
 =
1
A ; and VL = 15 V
273

∴ RL =
VL
 =
15
 = 45 Ω
I1 / 3


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