Amateur ExtraE7G01

What is the typical output impedance of an op-amp?

A
Answer
Practical circuits and system design
Type
A
Very low
B
Very high
C
100 ohms
D
10,000 ohms

Answer Notes

An ideal operational amplifier (op-amp) is designed to act as a perfect voltage source at its output, meaning it has an output impedance of zero. Real-world op-amps closely approximate this ideal, featuring an output impedance that is very low, typically just a few ohms to tens of ohms. This low output impedance allows the op-amp to drive current into varying loads without experiencing a significant drop in its output voltage. Distractors like 'very high' or '10,000 ohms' are incorrect because high output impedance would make the amplifier unable to supply sufficient current to a load, which is the exact opposite of what an op-amp is designed to do.
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