Exam-style question
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What is the concept of virtual earth in operational amplifier circuits?.
- A.The inverting input is at zero volts due to feedback.
- B.The output voltage is always equal to the input voltage.
- C.The non-inverting input is grounded.
- D.The op-amp has infinite input impedance.
Model answer
What a good answer should say
- The inverting input is at zero volts due to feedback.
Explanation
Why this works
In op-amp circuits, the virtual earth concept means that the inverting input is maintained at a voltage close to zero volts due to the feedback mechanism, allowing for accurate signal processing.
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