This video provides introduction to Switching models which will be utilized to explain the switching characteristics of MOSFET
...
https://www.youtube.com/watch?v=y6Xau3CeGVo
The root mean square value is the effective value that can be taken as equivalent to dc value. There is a historic perspective behind it. The method of finding it consists of three steps: Squaring the value, taking the average of the value over time and then calculating the square root of the value.
...
https://www.youtube.com/watch?v=Bo1XAZSvOf8
Turning off of Thyristor or SCR is an important process. SCR can be turned off in two ways: By applying Reverse bias and By bringing Anode current below Holding current. In order to understand turning off process a review of steady state characteristics is necessary
...
https://www.youtube.com/watch?v=xA8fwC5ggY4
This video provides details of conductivity modulation concept. Conductivity modulation is employed in power devices to do away with forward voltage drop. Conductivity modulation has a specialized phenomenon associated with it called double injection. Double injection is used to reduce the forward resistance of device significantly. In a power device, we always have an intrinsic region and that needs to be conductivity modulated to take care of extra drop on it.
...
https://www.youtube.com/watch?v=wNOyF3bCZrg
This video continues with the main topic of device operation and explains the process in further details
...
https://www.youtube.com/watch?v=zKKTSg3-_Zs
This video provides background to the Power BJT topic. Bipolar Junction Transistor is normally used as an amplifier in Analog Electronics. Amplification is majorly employed process and requires altogether different requirements from Transistor. So we will try to highlight the differences we have in two different fields of electronics.
...
https://www.youtube.com/watch?v=WP28kdkSVJY
This video provides details of construction of Insulated Gate Bipolar Transistor. It has features of Power BJT and Power MOSFET combined.
...
https://www.youtube.com/watch?v=rULIhh-XGD8