Hi all, this is my first topic on this blog. I thought of starting from the very beginning. This blog emphasis on improving subject knowledge related to Electrical/ Electronic/Power Electronic/Control Engineering.
I hope that the topics which will be posted through this blog will be helpful to people of different levels including students, engineers, and also who are somehow in electrical related field or interested in the same. simple topics will be discussed through this blog
so lets begin
Today in day to day life human kind cannot think of a day without electricity or its some form.
Of course in our schools we might have learned that electricity is flow of electrons, electrons is nothing but charge carries, equations for charge, potential difference etc, i don't want go to those equations and boring definitions
but have u ever wondered whats the difference between ac and dc current in physical means?
i mean we have learnt that electricity in nothing but the flow of electrons
in the case of alternating current how is the electrons moving actually?
Current is a measure of how much charge (or how many electrons) passes a given point in a circuit per second.
in the case of a direct current, this flow is only toward one direction only. in the case of alternating current the flow direction reverses during the negative half cycle and at a given point in a circuit in the case of ac no of electrons crossing at each instant of time will be varying. Ultimately the energy get transferred due to the drift velocity of the electrons.
potential is nothing but energy stored
in physics we learnt kinetic energy associated with velocity and potential energy associated with height
it is to be noted that for any stored energy , when given a chance(path) it will try to discharge it and come to equilibrium( or stable state)
similarly in the case of electrical potential energy when give a close path for the flow of electrons then in the case of ideal system(where there is no losses ) the energy might circulate, but since practically ideal system are not realisable and there are losses in the form of resistance, inductance, capacitive reactance etc , the energy get converted to one form till the potential difference are removed or potential made equal
alternating current is represented by sinusoidal waveform, which is the best way to represent the same
in the next topic basic expressions for dc and ac current, physical concepts behind
rms value
average value
heating, capacitive, and inductive effect will be discussed
if the readers have any comments, or inputs please post it
thanking you
ppk
