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

Circuit Power

  • Thread starter Xels
  • Start date
  • #1
19
0

Homework Statement



A generator with an rms voltage of 130V is connected in series to a resistor 3.65k[tex]\Omega[/tex] and a capacitor 3.00[tex]\mu[/tex]F.

Using the frequency found in part A (47.5Hz), find the average power consumed by this circuit.

[tex]\phi[/tex] = 17degrees

Homework Equations



Latex isn't working for me so I'm sorry for the formatting

Pavg = (Vrms/Z)VrmsCos(17)

Z=((36502+(1/(2*pi*47.5Hz*3.00*10-6Farad))2)(1/2)

Pavg = (Vrms/Z)VrmsCos(17)

Pavg = .1111 W

The answer is 4.23 W

I'm just trying to figure out where I went wrong.
 

Answers and Replies

  • #2
gneill
Mentor
20,793
2,773
It's hard to tell where you went wrong because you haven't supplied much in the way of intermediate results. For example, what value did you get for Z, the magnitude of the impedance?

When I compute (Vrms/Z)VrmsCos(17) I get the expected answer.
 
  • #3
19
0
After punching it through again I got the correct answer; I went wrong in the way I set up Hz; punching in 47.5^-1, since Hz = S^-1; but thats redundant...
 

Related Threads on Circuit Power

  • Last Post
Replies
17
Views
671
  • Last Post
Replies
1
Views
5K
  • Last Post
Replies
11
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
4
Views
4K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
8
Views
14K
  • Last Post
Replies
9
Views
2K
Top