The operational amplifier is______________?
Correct answer: A. A high gain amplifier
- A. A high gain amplifier
- B. A high-power amplifier
- C. A high resistance amplifier
- D. A low resistance amplifierStereo Systems & Components
Explanation
An operational amplifier is designed to have a very large open-loop voltage gain, so even a small differential input can produce a substantial output. Option c confuses high voltage gain with high resistance, although an op-amp also has high input resistance as a separate characteristic.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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