PhysicsChapter 9: Electronics
Transistor (npn Idea)
Introduction
A transistor is a semiconductor device used to control electrical signals and current. An NPN transistor has three terminals: Emitter (E) Base (B) Collector (C) A relatively small change in the base input can control a much larger collector-emitter current. This property allows a transistor to be used as: an electronic switch; an amplifier.
Definition
Basic Idea
The base acts as the control terminal. A suitable small base signal allows a larger current to flow through the collector-emitter path.
Exam preparation
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Review the key facts, formulas and checks before you move on.Transistor (npn Idea)
Sticky Notes · Quick Revision
NPN
- B → Base
- C → Collector
- E → Emitter
CONTROL
- Small input → controls larger output
60-second revision
- NPN transistor → B, C, E.
- Small base signal → controls larger current.
- Uses → switching + amplification.
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