AC Circuits

  • #1

Homework Statement



Lightbulbs labeled 40 W, 60W, and 100 W are connected to a 120 V/60 Hz power line as shown in the diagram. What is the rate at which energy is dissipated in each bulb?



Homework Equations



Pr = (Vrms)^2/R

The Attempt at a Solution



I'm not exactly sure how to get this one started. Do I have to make some sort of equivalency lightbulb? Can somebody please point me in the right direction?
 

Attachments

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
7
Voltage across each branch is the same. Using the relevant equation find the resistance of each lamp.

Find the equivalent resistance of the circuit and the current in each branch.

Energy dissipated in each lamp is given by I^2*R.

Now proceed.
 
  • #3
Thanks a bunch rl.bhat!
 

Related Threads on AC Circuits

  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
2
Views
829
  • Last Post
Replies
1
Views
930
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
12
Views
1K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
5
Views
819
Top