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!

Watts to kWH per month

  1. Dec 6, 2009 #1

    Monocerotis

    User Avatar
    Gold Member

    1. The problem statement, all variables and given/known data
    The question asks for us to go around our house, figure out the power usage of different devices, based on the estimated time use of these devices and calculate the total power usage per month.


    2. Relevant equations
    Energy = Power X Time
    Power = kW
    Time = hours


    3. The attempt at a solution
    Example

    Samsung TV
    Power usage @ 130.65W
    Usage @ 60 minutes per day (1 hour)

    (0.13065 kW)(1 hour) = 0.13065 kWh

    (0.13065 kWh)(31 days) = 4.05015 kWh per month

    Is that the correct way in trying to determine a given devices power consumption per month ?
     
  2. jcsd
  3. Dec 6, 2009 #2

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Looks good.
     
  4. Dec 6, 2009 #3

    Pengwuino

    User Avatar
    Gold Member

    Remember, when you multiply by 1 hour, what you're actually saying is it runs for 1 hour per day and thus takes 0.13065 kWh/day. If it ran for 8 hours, you'd instead have 8 hours * 0.13065kW per day giving around 1kWh/day.
     
  5. Dec 6, 2009 #4

    Monocerotis

    User Avatar
    Gold Member

    yeah, that's what I've been doing for devices I have listed that run longer than an hour

    for example our washing machine

    1200W - 210 minutes @ 4 days per month

    1.2kW x 3.5h = 4.2 kWh

    4.2kWh x 31 days = 130.2 kWh/month
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Watts to kWH per month
  1. KWH to Watts (Replies: 1)

  2. Costs per kWh (Replies: 15)

  3. Turning kWh Into Mass (Replies: 1)

Loading...