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Electronic circuits and components * Course Index * Introduction * About the Author * About this Course * Feedback * Course Navigation * How to use this Course * TINA * Locktronics Fundamentals * Introduction: Fundamentals * Units and Multiples * Electricity * Electronic Principles * Electrical Circuits * Alternating Current * Assessment: Fundamentals Passive Components * Introduction: Passive Components * Resistors * Capacitors * Inductors * Transformers * Batteries, Fuses, Lamps and Switches * Assessment: Passive Components Semiconductors * Introduction: Semiconductors * Diodes * Transistors ## Transistor Construction ## Transistor Symbols and Connections ## Transistor Operation ## Current flow Model ## Examples: Current Flow Model ## Transistor as a Current Amplifier ## Worksheet: Transistor as a Current Amplifier ## Transistor as a Switch * Logic Gates * Assessment: Semiconductors Passive Circuits * Introduction: Passive Circuits * Series and Parallel Connections * Kirchoff's Laws * Potential and Current Dividers * Passive Time Variant Circuits * Assessment: Passive Circuits Active Circuits * Introduction: Active Circuits * Power Supply Circuits * Operational Amplifier Circuits * Transistor Amplifier Circuits * 555 Timer Circuits * Assessment: Active Circuits Parts Gallery * Introduction: Parts Gallery * Passive Component Images * Semiconductor Images * Other Images * Quizzes |
(:Summary:Contains the 'action' links (like Browse, Edit, History, etc.), placed at the top of the page, see site page actions:) (:comment This page can be somewhat complex to figure out the first time you see it. Its contents are documented at PmWiki.SitePageActions if you need help. :) * Print (:comment (:if group Site,SiteAdmin,Cookbook,Profiles,PmWiki*:) (:comment delete if and ifend to enable backlinks:) * %item rel=nofollow class=backlinks accesskey='$[ak_backlinks]'% [[{*$Name}?action=search&q=link={*$FullName} | $[Backlinks] ]] (:ifend:) :) * Login Current Flow Model<^< Transistor Operation | Course Index | Examples: Current Flow Model >^>(:nl:)  Mobile electrons in the emitter region are attracted to the more positive potential present at the base. When these electrons enter the base region most are swept across into the collector region that has a higher positive potential than the base (remember that the base region is made very narrow). A few electrons recombine with vacant holes in the base. This results in a small current flow in the base. A much larger current flow appears in the emitter and collector. The typical currents in the diagram show that: * Collector current = 1.9 mA * Base current = 0.1 mA * Emitter current = 2.0 mA Note that electron flow and conventional current flow are in opposite directions. Hence, electron flow out of the collector is equivalent to current flow into the collector. We have shown the direction of current flow using arrows. By applying Kirchhoff's Current Law we can conclude that: Emitter current = Base current + Collector current (:nl:)(:table style="clear:both":)
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Page last modified on July 22, 2011, at 09:43 AM