1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How Six 2V lamps could be lit to their normal brightness.

Tags:
  1. Nov 17, 2015 #1
    1. The problem statement, all variables and given/known data

    NgoAEq6.png
    2. Relevant equations


    3. The attempt at a solution

    I'm not really sure how to attempt this question tbh. In order for the lamps to have normal brightness I think the circuit must be parallel. I also think maybe for A there can only be one lamp per branch because there's only 2V available, for B there can be 3 per row and for C it can just be series?
     
  2. jcsd
  3. Nov 17, 2015 #2
    Your attempt seems to be correct.
     
  4. Nov 17, 2015 #3
    Thank you :D I guess I did know haha. Any chance you could help with this?

    3pZzg52.png
    a) I know how to draw the circuit.
    b) I'm completely stuck on B. I'm guessing it involves omhs law but I can't see where.
    c) I can answer C with Potential difference (V) = current (I) x resistance (R).
    d) I'm not sure how to work out this.
     
  5. Nov 17, 2015 #4

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    What is the p.d. across X?
     
  6. Nov 17, 2015 #5
    Potential difference (V) = current (I) x resistance (R)

    Potential difference (V) = 2 x Resistor X?
     
  7. Nov 17, 2015 #6
    Yes, we'd like to help you with this, but at first please start a new thread with this problem. According to the forum rules only one problem should be discussed in each thread.
     
  8. Nov 17, 2015 #7
  9. Nov 17, 2015 #8
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: How Six 2V lamps could be lit to their normal brightness.
Loading...