Which of the following electronic components can amplify signals? [T6B05]
B. Variable resistor
C. Electrolytic capacitor
D. Multi-cell battery
The answer is, as luck would have it, A. Transistor. The transistor is probably the miracle of 20th century technology. It’s an amplifier, a switch, and so much more.
None of the other components listed have the ability to amplify a signal.