Question
Which of the following types of linear voltage regulator operates by loading the unregulated voltage source?
Answer Options
- A) A constant current source
- B) A series regulator
- C) A shunt current source
- D) A shunt regulator
Correct Answer: D
Explanation
Linear voltage regulators are categorized by the way the control element is wired relative to the load. A series regulator places the control element between the source and the load. A shunt regulator places the control element in parallel with the load.
A shunt regulator (like a basic Zener diode circuit) works by maintaining a constant output voltage by drawing away or ‘shunting’ any excess current away from the load through the control element to ground. Because the current drawn from the source constantly varies to keep the output voltage stable, it is said to operate by loading the unregulated voltage source.
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