newstudent1234
Badges: 9
Rep:
?
#1
Report Thread starter 4 weeks ago
#1
I'm sorry but what just happened here? Can someone explain? All I know is the capacitor stuff learnt at A lvl...

Name:  cap.JPG
Views: 11
Size:  18.2 KB
Last edited by newstudent1234; 4 weeks ago
0
reply
Callicious
Badges: 22
Rep:
?
#2
Report 4 weeks ago
#2
They seem to have skimped on capital letters...?

\frac{d}{dt}\left[q=CV\right] \rightarrow \frac{dq}{dt}=C\frac{dV}{dt} \rightarrow I(t)=C\frac{dV}{dt}

This part was definitely covered at A-Level (right at the start when discussing the basics of capacitors, at least in AQA. Idk about OCR or the others, but I would expect it to be so.)

The next part is just working backwards, and is just an integral...

 \int I(\tau)d\tau = \int CdV

where you'd throw in some boundary conditions, etc, to retrieve I(t) and V(t).

Capacitance has been assumed constant here, which for all purposes is what you should assume for any component.
Last edited by Callicious; 4 weeks ago
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Have you made your mind up on your five uni choices?

Yes, and I've sent off my application! (156)
55.12%
I've made my choices but havent sent my application yet (41)
14.49%
I've got a good idea about the choices I want to make (31)
10.95%
I'm researching but still not sure which universities I want to apply to (26)
9.19%
I haven't started researching yet (16)
5.65%
Something else (let us know in the thread!) (13)
4.59%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise