Capacitators and currents

  • Thread starter name_ask17
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  • #1
name_ask17
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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
 

Answers and Replies

  • #2
gneill
Mentor
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Watch your orders of magnitude. What are the given units of capacitance?
 
  • #3
name_ask17
146
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columb per volt and they give 4 and 7- but how do i fing thr charge using the equation above?
 
  • #4
gneill
Mentor
20,945
2,886
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?
 
  • #5
name_ask17
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isnt it just 11??
but how does that lead me to charge?
 
  • #6
gneill
Mentor
20,945
2,886
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!).
 
  • #7
name_ask17
146
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OH! ok thanks you because what i was doing was not converting it back to c
 
  • #8
name_ask17
146
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but THANKS, you really did help
 

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