• Support PF! Buy your school textbooks, materials and every day products Here!

Voltage drop across capacitor

  • Thread starter Joel Kee
  • Start date
  • #1
13
0

Homework Statement


I'm trying to calculate the voltage drop across a 60uF and a 30uF capacitor in series, powered by 60V. Is the formula for voltage drop across capacitor opposite of the formula for resistor, where resistor is R1=R1/(R1+R2) while capacitor is C1=C2/(C1+C2)?

Homework Equations




The Attempt at a Solution

 

Answers and Replies

  • #2
34,056
9,918
Is the formula for voltage drop across capacitor opposite of the formula for resistor, where resistor is R1=R1/(R1+R2) while capacitor is C1=C2/(C1+C2)?
The symbols on the left side don't make sense. The right side is useful, but you should probably derive those equations to be sure.
 
  • #3
13
0
The symbols on the left side don't make sense. The right side is useful, but you should probably derive those equations to be sure.
My bad, the eqs are supposed to be multiplied with the total voltage.
 
  • #4
NascentOxygen
Staff Emeritus
Science Advisor
9,244
1,071
It is far better that you be confident at deriving such formula yourself using basic knowledge.

The crux of the matter is that when connected to a source, equal amounts of charge are added to each of the series-connected capacitors.
Use this fact, together with Q = C·V, to confirm or disprove the formula you wrote.
 
  • #5
rude man
Homework Helper
Insights Author
Gold Member
7,631
717
My bad, the eqs are supposed to be multiplied with the total voltage.
Still your bad. R1=R1/(R1+R2) ??? Etc.
 
  • #6
13
0
Still your bad. R1=R1/(R1+R2) ??? Etc.
V1=[R1/(R1+R2)]V

My bad.
 

Related Threads on Voltage drop across capacitor

Replies
7
Views
21K
Replies
3
Views
4K
  • Last Post
Replies
2
Views
12K
  • Last Post
Replies
4
Views
845
  • Last Post
Replies
3
Views
812
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
4
Views
923
Replies
20
Views
1K
  • Last Post
Replies
4
Views
5K
Replies
4
Views
18K
Top