1. Limited time only! Sign up for a free 30min personal 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!

Light bulb(electric current)

  1. Apr 2, 2013 #1
    1. The problem statement, all variables and given/known data
    What is the maximum number of 60.0 W light bulbs that can be put in a household circuit (V= 110V) without tripping the circuit breaker if the maximum current through the circuit is 20.0 A?

    2. Relevant equations

    P= Vi

    3. The attempt at a solution

    P= VI => I=P/V for each light bulb's current...I= 60/110v = 0.545454A for 1 light bulb.

    Max 20.0A so 20/0.545454 = 36.66666666 => 36 light bulbs you can put max.

    Please check see if i got it right.
  2. jcsd
  3. Apr 2, 2013 #2


    User Avatar
    Homework Helper

    The logic is good. In practice you may be in trouble since a 60 W light globe briefly operates at more than 60W when it is first turned on, so if you switched them all on at once the fuse may trip.
  4. Apr 2, 2013 #3
    ahh thank you. This is for an assignment so we are not actually going to do that in real life. Just wondering if my calculations are right!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads - Light bulb electric Date
Electrical power of a lightbulb Jun 19, 2016
E&M: AC Circuit Light Bulb Apr 12, 2015
Rms Electric Field of a light bulb Mar 23, 2011
Electric field strength from a light bulb Feb 22, 2008