How Do You Calculate Charge in Parallel Capacitors?

  • Thread starter Thread starter name_ask17
  • Start date Start date
  • Tags Tags
    Currents
Click For Summary

Homework Help Overview

The problem involves calculating the total charge stored on two capacitors connected in parallel, specifically a 4.0-µF and a 7.0-µF capacitor across a 25-V battery. The subject area is electrical circuits, focusing on capacitance and charge relationships.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the application of the equation q=Cv and question the correct units for capacitance. There is an exploration of how to find total capacitance and its implications for calculating charge.

Discussion Status

Some participants have provided guidance on ensuring correct unit conversion and understanding the relationship between capacitance and charge. There is an ongoing exploration of the correct total capacitance and its units, with no explicit consensus reached yet.

Contextual Notes

Participants are addressing issues related to unit conversion and the proper interpretation of capacitance values given in microfarads. There is a focus on ensuring that calculations are performed with the correct units to avoid errors.

name_ask17
Messages
146
Reaction score
0

Homework Statement


A 4.0-µF and an 7.0-µF capacitor are connected in parallel across a 25-V battery. Find
the total charge stored on the two capacitors.




Homework Equations


q=Cv


The Attempt at a Solution


i did the eqivalent capactiy*25 volts to get 275 C as the charge but that was marked incorrect- will you explain to me what i am doing wrong? thanks ahead for assistance
 
Physics news on Phys.org
Watch your orders of magnitude. What are the given units of capacitance?
 
columb per volt and they give 4 and 7- but how do i fing thr charge using the equation above?
 
name_ask17 said:
columb per volt and they give 4 and 7- but how do i fing thr charge using the equation above?

What is the total capacitance in Farads?
 
isnt it just 11??
but how does that lead me to charge?
 
name_ask17 said:
isnt it just 11??
but how does that lead me to charge?

No, it's not "11". The 11 has units. What are the units that the capacitors were specified with in the problem statement?

Once you have the total capacitance expressed in the correct units, then you can use the method that you employed previously to find the charge (with the correct units!).
 
OH! ok thanks you because what i was doing was not converting it back to c
 
but THANKS, you really did help
 

Similar threads

Capacitors in Series and Parallel
  • · Replies 1 ·
Replies
1
Views
4K
Capacitors in a circuit with switches
  • · Replies 5 ·
Replies
5
Views
5K
Capacitor Questions Charging and Discharging
  • · Replies 4 ·
Replies
4
Views
4K
How to find the charge on each capacitor
  • · Replies 3 ·
Replies
3
Views
3K
What is the final charge and potential difference on each capacitor?
  • · Replies 3 ·
Replies
3
Views
7K
Capacitors in Parallel: Finding the Relationship Between Capacitance and Charge
  • · Replies 6 ·
Replies
6
Views
3K
Capacitors - charged in parallel and reconnected to one another.
  • · Replies 5 ·
Replies
5
Views
6K
Capacitors charged in parallel
  • · Replies 3 ·
Replies
3
Views
2K
How Do You Calculate Capacitance in a DC Circuit with a Fully Charged Capacitor?
  • · Replies 3 ·
Replies
3
Views
2K
Which quantities are not the same for this capacitor setup?
  • · Replies 5 ·
Replies
5
Views
2K