Advanced Qualification · A-004 Power supplies · A-004-003-007
What is a three-terminal regulator?
- A A regulator that supplies three voltages at a constant current
- B A regulator containing three error amplifiers and sensing transistors
- C A regulator that supplies three voltages with variable current
- D A regulator containing a voltage reference, error amplifier, sensing resistors and transistors, and a pass
Correct answer: D — A regulator containing a voltage reference, error amplifier, sensing resistors and transistors, and a pass. From the official ISED question bank, verified word for word.
Why
A three-terminal regulator is right because it is a complete circuit built inside a single package that uses a voltage reference, an error amplifier, sensing resistors and transistors, and a pass element to keep the output steady. The full explanation — and one for every question — is in Pro.
Practise this section
Power supplies: rectifiers, filtering, regulation, switching supplies and their failure modes.