Transistor can work as a Switch or an Amplifier. We take a look at how the transistor can amplify a current. A tiny electric current flowing through one part of the transistor can make a much bigger current flowing through another part of it. It doesn’t actually amplify the current flowing though it. It is actually means a current flow from the base to the emitter “opens” the flow of current from the collector to the emitter.
c = collector, b = base, e = emitter
Base current * the transistors gain (hFE or hfe) = how much collector current ‘could’ flow.
In the above diagram, you need to apply a small control voltage between the base and the emitter to get the current flow from base to emitter (Blue). When you’ve done this, it will turn the transistor ON and allow a bigger portion current to flow from collector to emitter (Red).
Notes: The collector resistor determines the maximum current that can flow through the collector. Maximum base current when forward biased depends entirely on heat and thus will change based on ambient conditions.
In other words, it’s a kind of current booster. That comes in really useful in things like hearing aids, one of the first things people used transistors for.
Transistors are semiconductor devices which means both conductive allowing current to pass through them or non-conductive which block current from flowing through it. It can be used as an electronic switch to turn a current on and off. There are different types of transistors. A very common is the “Bipolar junction transistor” or “BJT”. It...
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