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2.2. Analogue electronics.Transistors (2). How do they work?

Hey there.Today I'm going to show you how a transistor works. The transistor looks like this.
This is a standard very common bipolar junction transistor, it's the NPN type. In verse like this;  if you have a small current going from the base to the maker,here, you turn the transistor on and you allow for a bigger current to go from the collector to the major, here, and to turn the transistor on you need about 0.7 vats from the base to the emitter.
Here we have a simple circuit with a 9-volt battery and LED and a resistor. Here i have the circuit connected on red born and a battery. When i connect the
battery to the circuit the LED lights up.
Ok, so now i connected a transistor here. There's nothing connected to the base of the transistor so the transistor will be off. Here i have the circuit with
the battery and LED and the transistor and it does not let up.
What we need to do to turn the transistor on is to put 0.7 volts from base to the emitter so let's do that. I connected a battery with a resistor to the base of the transistor and when i connect the battery to the base of transistor the LED lights up and a cool thing about this is that you can connect some kind of circuit here. For example, a circuit that detects light so that the LED will turn on automatically when it gets dark.
So to sum it all up, the transistor works like this with a small current going here from the base to the emitter the transistor will be turned on and it will allow for bigger current to go here from the collector to the emitter.
 
I hope you learn something from this video today post your questions and comments in the comment field below and don't forget to subscribe to my youtube channel. Also check out my website to learn exactly what you need to build electronics. Thanks for watching

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