As shown in figures "A", "B", and "C" of the...

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Question 1 of 205eccefa5bacbc34ba4d486b4

As shown in figures "A", "B", and "C" of the illustration, if the negative DC signal voltage is more negative at the inverting input than at the non-inverting input, what will be the characteristic of the output? See illustration EL-0111.

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🔍 Key Concepts

• Operational amplifier (op-amp) symbol in figure A and C, noting which terminal is the inverting (-) input and which is the non-inverting (+) input • How an op-amp’s output polarity relates to which input has the more positive (or less negative) voltage • Difference between an ideal op-amp used as a comparator (very high gain) versus a simple subtractor (actual difference of inputs)

💭 Think About

• If the inverting input (-) is at a more negative voltage than the non-inverting input (+), which input is effectively more positive? How does that affect the sign of the output for an op-amp? • Look at the internal blocks in figure A labeled Differential Amplifier and Voltage Amplifier. Does an op-amp normally provide just the small input difference at the output, or does it multiply that difference by a very large gain? • Imagine slowly increasing the voltage on the non-inverting (+) input while keeping the inverting (-) input fixed. At the moment when the + input becomes higher than the – input, what happens to the output direction (positive vs. negative)?

✅ Before You Answer

• Be clear which terminal in the illustration is + (non-inverting) and which is − (inverting) before deciding the sign of the output. • Decide whether the device in EL-0111 is behaving as a high‑gain amplifier/comparator or a simple difference meter that outputs only the small, actual difference. • Confirm that when V+ > V− on an op‑amp, the output tends to drive toward the positive supply, and when V− > V+, it tends to drive toward the negative supply; then match that behavior to the wording of the choices.

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