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!

Find current with give volts and kWh

  1. Mar 11, 2009 #1
    1. The problem statement, all variables and given/known data

    A typical American family uses 800 kWh of electricity a month.
    What is the average current in the 120 V power line to the house?

    2. Relevant equations

    P=IV

    3. The attempt at a solution

    800kW=800000W
    800000=120I
    I=[tex]\frac{800000}{120}[/tex]

    I'm getting this answer as incorrect. I'm not sure what to do from here. Help Please, Thanks!
     
  2. jcsd
  3. Mar 11, 2009 #2

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    kWH is a measure of energy = kW (power) * hours (time)
     
  4. Mar 11, 2009 #3
    so how do I get from kWh to W?
     
  5. Mar 11, 2009 #4

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    1KWh is 1Kw for 1 hour.
    If they use a total of 800 kWhours for the whole month, how much do they use each hour?

    hint - how many hours in a month?
     
  6. Mar 11, 2009 #5
    approx. 30.44 days in a month 30.44*24=730.56 hours in a month. 800000Wh/730.56h = 1095 W! oh... lol. DUH! Thanks! :D
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Find current with give volts and kWh
  1. Electric current/kWh (Replies: 1)

  2. How to find kwh (Replies: 1)

Loading...