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Generate QuizGK Question
Which component is used to amplify weak electrical signals in analog circuits?
- Diode
- Transistor
- Resistor
- Capacitor
Answer: Transistor
Transistor (BJT or FET) amplifies weak signals by using small input current/voltage to control larger output current. Configurations: common emitter (high gain), common collector (impedance matching). Foundation of audio amplifiers, radio receivers, and sensor interfaces. Operational amplifiers (op-amps) integrate multiple transistors for precision amplification.