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Question & Answer
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Measuring the voltage drop across a resistor in a closed circuit
Amplifying the difference between two sensor outputs to control a motor
Directly connecting a battery to power a light bulb
Using a capacitor to filter high-frequency signals from an audio source
Understanding the Answer
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An op‑amp takes two input voltages and produces an output that is a large, controlled difference of those inputs. Other options are incorrect because Measuring a voltage drop uses a voltmeter, not an amplifier; Connecting a battery to a light bulb is a basic power supply, not an amplifier.
Key Concepts
Operational Amplifiers Basics
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Definition
Operational amplifiers (op-amps) are devices that amplify the difference between their two inputs by a large gain factor. They have five terminals, including power supply terminals, inverting and non-inverting inputs, and an output terminal.
Topic Definition
Operational amplifiers (op-amps) are devices that amplify the difference between their two inputs by a large gain factor. They have five terminals, including power supply terminals, inverting and non-inverting inputs, and an output terminal.
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