In the amplitude modulation equation,
V=(Ec+Ei*coswt)coswt
I don't understand why the instantaneous value of information signal is used. Shouldnt it be peak value as that would give the maximum value (amplitude)?
If an engine that requires 3kW to run exists... How many units of electricity will it consume in an hour... (1kWhr=1unit).
I cannot get my head around this. I am new to this topic and with no one around to help me. This might be very basic to you all but i am just a kid. Sorry about that...
So many telecom operators claim that their users will get network coverage even inside an elevator. But according to Gauss' theorem, no charge is supposed to exist inside a closed conductor and an elevator (made of metal) is a closed conductor... So how is one supposed to get network coverage...
tell me if i am right
through an inductor when AC current flows... because of ampere's law magnetic field is created... but since the current is always changing, the magnetic field is always changing... now due to faraday's law... the changing magnetic field causes a emf... but according the...
yeah i know about the inductor a little... it stores electrical energy in terms of magnetic field... yes i know what back emf is... it is the emf that opposes the applied emf due to self inductance?
i had also mentioned about whether back emf is the cause of current lagging before...
in an inductor... with time current will increase and voltage will decrease?
so the current-time graph of the capacitor will look like the voltage-time graph of the inductor?
sorry i had made a mistake... i forgot the root sign... but i think this time i got it correct..
could you please check it for me...
PS: moderators... i m not posting the solution... i am actually checking if what I've done is correct...
http://img831.imageshack.us/i/p1010910lr.jpg/
yeah now
5
\int tan\theta tan\theta sec\theta d\theta
put t = sec\theta
therefore dt = sec\theta tan\theta d\theta
draw a right angled triangle... using t = sec\theta.. you'll get value of two sides... find the value of the third side by pythagoras theorem... that way now you can find...
hey studiot... thanks a lot... the graphs helped
hey berkeman... thanks a lot to you too... there is no confusion now
about the capacitor, i have a clear idea now... thanks to you both!
FOR INDUCTIVE CIRCUIT:
I must always be a sine wave... therefore e will be cosine wave... thus i lags...
yeah i get that they are proportional... what i don't understand is how does current proportional to change in voltage and voltage proportional to change in current suggest whether current lags or leads... kindly elaborate...
i kinda understood what studiot said about capacitors... can a...
thanks!..
now just to summarize... tell me if I'm right..
In a capacitive circuit, for a small change in voltage, there is a large change in current... so current is always more in the circuit... thus current is always leading the voltage
for a inductor, a small change in current results in...
@berkeman
yeah that did help a lot
i was familiar with the differential equation for inductance.. just didnt know that it is called that
however could you temme how do you get that differential equation for capacitance? please!
@studiot
totally helped.. thanks a ton... but i'd like to see those curves... want to see if they are like how i imagine them to be...
Could you also explain with that simplicity why current would lag behind the emf in an inductive circuit?... that'll help a lot sorting out my confusion about...
no i haven't seen those curves
i have a rough idea of what happens when capacitor is connected to DC circuit... temme if m correct..
When DC is applied to capacitive circuit, current flows for a very short time till the capacitor is filled and then there is no current in the circuit as the...
yeah that is the rest mass... and light is never at rest
so isn't talking about the other mass a little more practical?
and 0/0 still is infinite right? so the other mass is infinite...
doesnt that mean that when light falls on me... i should be blown (no pun intended)?
PS: as you can judge by...
Hey people!.. this is what I've been wondering for a while and couldn't come up with anything (asked my frnds too)
It has been derived in my textbook that when AC is applied to a pure capacitive circuit (i.e. contains only a capacitor)... current leads ahead of the emf by phase difference of...
m_{SR}=\frac{m_{0}}{\sqrt{1-\frac{v^{2}}{c^{2}}}}
according to this formula... anything that travels with speed of light will have infinite mass...
but light also travels like a matter... and so light(matter) obviously travels at the speed of light... doesn't it imply that light(as a...
'it is emf when no current is flowing outside the cell. Whereas, it is potential difference is when current actually flows out of the cell."
"that emf is the potential difference when there is no current flowing through the circuit or when the key is open. Whereas, the circuit has certain...