Exam-style question
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In an op-amp circuit using virtual earth, what happens to the input signal at the inverting terminal?.
- A.It is amplified directly.
- B.It is inverted and amplified.
- C.It is effectively at zero volts.
- D.It is ignored by the op-amp.
Model answer
What a good answer should say
- It is effectively at zero volts.
Explanation
Why this works
In a virtual earth configuration, the inverting terminal of the op-amp is held at approximately zero volts due to the feedback, allowing for accurate processing of the input signal.
Common mistake
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