Exam-style question
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Which circuit diagram represents a non‑inverting amplifier? The op‑amp has the input connected to the + terminal, a feedback resistor R1 from the output to the − terminal, and a resistor R2 from the − terminal to ground.
- A.Op‑amp with input connected to + terminal, feedback resistor from output to −, resistor from − to ground
- B.Op‑amp with input connected to − terminal, feedback resistor from output to +, resistor from + to ground
- C.Op‑amp with input connected to + terminal, no feedback resistor
- D.Op‑amp with input connected to − terminal, no feedback resistor
Model answer
What a good answer should say
- Op‑amp with input connected to + terminal, feedback resistor from output to −, resistor from − to ground
Explanation
Why this works
Formula/rule: In a non‑inverting amplifier the input is at the + terminal, a feedback resistor connects output to the − terminal, and a resistor connects the − terminal to ground. Substitution: The described circuit matches this arrangement.
Working: This matches the rule for a non‑inverting amplifier. Answer: Op‑amp with input connected to + terminal, feedback resistor from output to −, resistor from − to ground.
Units/conclusion: The circuit is a non‑inverting amplifier.
Common mistake
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