Discussion
Which method limits the output of a modern regulator?
Answer: D
Solid state regulators switch the field transistor at a high frequency and vary the duty cycle. Series resistance wastes power as heat and was the vibrating contact era approach, which makes those options historically real. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once.
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