Exam-style question
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Which statement best describes the phase relationship between input and output in an inverting amplifier?.
- A.Output is in phase with the input
- B.Output is 180° out of phase with the input
- C.Output is 90° out of phase with the input
- D.Output is 0° out of phase with the input
Model answer
What a good answer should say
- Output is 180° out of phase with the input
Explanation
Why this works
Define both: Inverting amplifiers produce an output that is inverted relative to the input, whereas non‑inverting amplifiers produce an output that is in phase with the input. Identify key difference: the phase inversion.
Explain when each applies: use an inverting amplifier when a negative gain is required; use a non‑inverting amplifier when a positive gain is needed. Conclude: the correct statement is that the output is 180° out of phase with the input.
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