Diode forward voltage and voltage drop basics explained and demonstrated by electronzap

Diodes and LEDs (a diode that light up) have forward voltage drop which is a very important part of most every circuit and therefore is important to understand if you want to understand electronics.

[PushpaKumari-mclt]

Is donor state means the same as conduction band or valence band ?

[realtrickybilly]

Question: can you use the USB port of that power supply module to power the breadboard? I have heard it has a female USB connector, but I do have a male to male USB cable to solve this. In short: I want to use the USB port of my computer or cell phone power bank to power my breadboard. I have heard that the USB port of the power module is meant for a power output for like powering an Arduino, etc. (and the black part of it is the input) but can it be used as a power input in practice? Btw. where does that black cable come from in your video that is powering the module, an adapter from AC or?

[kryptonxxx]

How important is the forward currwnt on a varactor diode? I need a spare what is obsolent so digikey told me an other model but it has 20mA instead of 250mA..could i usw that varactor? It's used for ans usb port for the aignal lines to the stm32 in an rc transmitter