Stuck on homework question involving differential equations of RC circuit

dcarmichael

Joined Oct 31, 2019
2
Ive comepleted part A V(0-) will equal V(0+) and therefor V(0+) will be 12v, how do find dv(0+)/dt before computing the thevenin equivalent circuit?

Mod: Tidied image.E

Last edited by a moderator:

RPLaJeunesse

Joined Jul 29, 2018
195
Start with the basic equation I(c) = C * dV/dt which you should memorize. (Still useful 50 years after I learned it.)
Rearrange to solve for dV/dt
Look at what you need to know, in this case at time t(0+)
Given that, what do you know, and what do you need to figure out?
Hint: Kirchoff's current law.

dcarmichael

Joined Oct 31, 2019
2
Start with the basic equation I(c) = C * dV/dt which you should memorize. (Still useful 50 years after I learned it.)
Rearrange to solve for dV/dt
Look at what you need to know, in this case at time t(0+)
Given that, what do you know, and what do you need to figure out?
Hint: Kirchoff's current law.
I(c)/C=dv/dt and i would need to find i(0+) in order to solve

RPLaJeunesse

Joined Jul 29, 2018
195
Correct. So what is i(0+)?