Maker Pro
Maker Pro

Does electron die?

Status
Not open for further replies.

RRITESH

Oct 10, 2010
85
Joined
Oct 10, 2010
Messages
85
Hello,
Thanks for giving this useful information:

please tell some dc circuit example.....
dV/dt = I / C for capacitors
dI/dt = V / L for inductors
 

RRITESH

Oct 10, 2010
85
Joined
Oct 10, 2010
Messages
85
I mean circuit example
ok, i have this upload_2016-5-23_18-21-0.png

I want to calculate Current in capacitor?

how this is coming in 0.56fA what is f here?

upload_2016-5-23_18-22-12.png
 

CDRIVE

Hauling 10' pipe on a Trek Shift3
May 8, 2012
4,960
Joined
May 8, 2012
Messages
4,960

Ratch

Mar 10, 2013
1,099
Joined
Mar 10, 2013
Messages
1,099

RRITESH

Oct 10, 2010
85
Joined
Oct 10, 2010
Messages
85
Hello,
Yes i am using DC source to study Charging of Capacitor with series resistance

What are you talking about? Your schematic shows a DC source being applied to a resistor and capacitor in series. Why is frequency involved?

Why are you using differential equation?
 

Ratch

Mar 10, 2013
1,099
Joined
Mar 10, 2013
Messages
1,099
Hello,
Yes i am using DC source to study Charging of Capacitor with series resistance



Why are you using differential equation?

Did you not ask for an example in post #61? If you are going to use differentials to specify currents and voltages in a circuit, then you have to solve those differential equations.

Ratch
 

RRITESH

Oct 10, 2010
85
Joined
Oct 10, 2010
Messages
85
ok this one dV/dt = I / C for capacitors

But i dont understand why are you using integral?
please tell in step.
 

Ratch

Mar 10, 2013
1,099
Joined
Mar 10, 2013
Messages
1,099

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
LTSPICE calculates a stable starting state before taking data. The stable state has the capacitor completely charged, so you don't see the exponential fall in current which actually happens.

To see that, you need to check the box "skip initial operating point solution" box on the "Transient" panel of the Simulation Control.

Bob
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
That is because you are simulating 9000 seconds. The capacitor is fully charged in about 20mS. Try 20m for the simulation time (20 milliseconds.)

Bob
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
The voltage curve shows the voltage with respect to time.

The current curve shows the current with respect to time.
 

RRITESH

Oct 10, 2010
85
Joined
Oct 10, 2010
Messages
85
How they are calculating value?

rc2.gif
 

RRITESH

Oct 10, 2010
85
Joined
Oct 10, 2010
Messages
85
what are 5 time constant.
anyway i am now better understanding with ltspice than before.
 
Status
Not open for further replies.
Top