A transistor functions mainly as a
A. switch and an amplifier
B. rectifier and an amplifier
C. charge store and a switch
D. charge store and an amplifier
A transistor can function both as a switch and as an amplifier.
It acts as an amplifier when it takes in small input current or signal and give out larger output current or signal.
It also acts as a switch when the current through the base is turned on or off. When the current through the base is on, current flows between the collector and emitter, but when the current through the base is off, current stops flowing between the collector and emitter.
Now for the right answer to the above question:
- Option A is correct.
- Option B is incorrect. a transistor does not function as a rectifier.
- C is incorrect. capacitors are charge stores and not transistors.
- D is not the correct answer. Transistors do not store charges.
You may please note these/this:
- Transistors are three terminal devices which can both amplify and switch electrical signals.
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/ culled from 2017 JAMB-UTME physics question 17 /