Exam-style question
Try this first
In which configuration does the output voltage have the same polarity as the input voltage?.
- A.Output polarity is opposite to input polarity
- B.Output polarity is the same as input polarity
- C.Output polarity is unrelated to input polarity
- D.Output polarity depends on resistor values
Model answer
What a good answer should say
- Output polarity is the same as input polarity
Explanation
Why this works
Define both: Inverting amplifiers produce an output with opposite polarity to the input; non‑inverting amplifiers produce an output with the same polarity. Identify key difference: polarity of the output.
Explain when each applies: use an inverting amplifier when a negative output is required; use a non‑inverting amplifier when a positive output is required. Conclude: the correct answer is that the output polarity is the same as the input polarity.
Common mistake
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