Advanced Qualification · A-002 Advanced components and circuits · A-002-008-006
What is the output impedance of a theoretically ideal op-amp?
- A Exactly 1000 ohms
- B Very low
- C Very high
- D Exactly 100 ohms
Correct answer: B — Very low. From the official ISED question bank, verified word for word.
Why
An ideal operational amplifier acts like a perfect voltage source, meaning it can deliver current to a load without its output voltage dropping, which requires the output impedance to be very low. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.