Flashcards on The transistor as a switch and an amplifier
The Transistor: Switch and Amplifier Explained for Students
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Transistor as Switch
22 cards
Card 1
Question: What is a primary application of transistors beyond amplification?
Answer: Transistors are widely used as electronic switches.
Card 2
Question: How does a transistor behave when used as an electronic switch?
Answer: It is either fully ON (conducting maximum current) or fully OFF (conducting virtually no current).
Card 3
Question: What kind of behavior is fundamental to logic circuits, microcontrollers, and power control applications?
Answer: The digital behavior of a transistor acting as a switch.
Card 4
Question: What is the purpose of using a transistor in power control applications?
Answer: To control a larger power load, such as turning on a lamp, a motor, or a relay, with a small signal.
Card 5
Question: What two distinct regions is a transistor operated in when used as a switch?
Answer: Cut-off (OFF state) and saturation (ON state).
Card 6
Question: Which region of transistor operation is bypassed when using it as a switch?
Answer: The active region.
Card 7
Question: What is the OFF state of a transistor switch also known as?
Answer: Cut-off region.
Card 8
Question: What condition leads to a transistor being in the OFF state (cut-off region)?
Answer: No base current (or a very small, negligible current) flows, and the base-emitter junction is either reverse-biased or not sufficiently forward-biased
Card 9
Question: What is the approximate collector current (I_C) when a transistor is in the OFF state?
Answer: I_C ≈ 0
Card 10
Question: How does a transistor act in the OFF state regarding current flow to the load?
Answer: It acts like an open switch, blocking the flow of current to the load.