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Dude, keep doing these, please. Im in HVAC school, and you summed up 2 hours or more of reading here.

Excellent video on the ( N P N ) transistor, I needed that !

Want more like this!! Come on Bro very nice video!!

luv you for the last rain sensor example.. it was an amazing concept, when water drops on the un connected conductor circuit complets and currents starts to flow through base and working of transistor starts and speakers starts producing sound👏👏👌👌

The transistor was originally thought as a non starter, being invented in 1846 was far too bulky for any practical use. Having a very large cylindrical tank to hold the electrons with various taps and valves to drain and add electrons as required. In the late 19th century The Clayton steam boiler company of Grandington Ohio would be the first company to use a smaller version but found the main cylinder could not hold enough electrons to operate there heavy equipment.

@1:11-you mean 2 p type sandwich one n type between them. (You say 2 p are sandwiched between 2 n, which makes no sense) Right after that, you speak of current flow, but don't specify that you mean CONVENTIONAL current. (The electrons actually flow the other way.) @1:53 you say the high resistance acts like a closed switch, but you mean an open (not conducting) one.

One of the confusing statements about transistors I heard when I was a teenager is that they act as an Amplifier. and still now after some years of experience I can tell you they're not amplifiers. they're used in an amplifier circuit but they do not act as amplifiers. here's the thing: the transistor has a certain middle-state(bias) between the extremes On and Off states where you can play with hight current side of the circuit (collector-emitter) by acting on the low current side of the circuit (base) Luckily, it happened that the ratio (in/out currents) is linear which makes it useful to produce a higher current version of the low input base current.