Discussion
What is the maximum load current a shunt regulator can supply?
Answer: A
The load may take everything the resistor passes except the small current the diode needs to stay in breakdown. The power rating sets the other end of the range, the no-load case. Adding the diode's current rather than subtracting it inverts the relationship, and the input current is what the resistor passes rather than a separate quantity. A shunt regulator's whole design reduces to making the resistor's current cover the worst case at both extremes.
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