Ask Experts Questions for FREE Help !
Ask
    scottgist's Avatar
    scottgist Posts: 1, Reputation: 1
    New Member
     
    #1

    Oct 1, 2008, 04:10 PM
    How many watts equal 1 amp?
    I am trying to figure how many watts a 20 amp circuit can carry.
    Xrayman's Avatar
    Xrayman Posts: 1,177, Reputation: 193
    Ultra Member
     
    #2

    Oct 1, 2008, 04:37 PM

    use P = I^2 x R

    You need to know what load resistance you intend to load the circuit with.

    then go (20x20) x (load resistance in ohms) = power in Watts

    cheers
    ceilingfanrepair's Avatar
    ceilingfanrepair Posts: 5,733, Reputation: 109
    Uber Member
     
    #3

    Oct 1, 2008, 05:52 PM

    2400 watts. Derated 1920 watts, I forget the rules for derating.
    Dave Ermeling's Avatar
    Dave Ermeling Posts: 173, Reputation: 3
    Junior Member
     
    #4

    Oct 1, 2008, 06:00 PM
    Assuming your talking about a 120 volt circuit, a 20 amp circuit is potentially capable of 2400 watts. That's forty light bulbs with 60 watt output. It all depends on how much resistance your putting in the circuit though.
    Attached Images
     
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
     
    #5

    Oct 1, 2008, 07:12 PM

    Also, Volts X Amps equals Watts.
    1 Amp at 12 volts is 12 watts
    1 Amp at 120 volts is 120 watts
    A 1200 watt hair dryer draws 10 amps
    (1200/120=10)watts divided by volts equals amps
    Dave Ermeling's Avatar
    Dave Ermeling Posts: 173, Reputation: 3
    Junior Member
     
    #6

    Oct 2, 2008, 03:20 PM

    Yes, E x I = P
    P / E = I
    P / I = E

    It's all there in the Ohms law chart. All you need is 2 of the factors P, I, E, R and you can just plug it into the chart.
    iceqube's Avatar
    iceqube Posts: 1, Reputation: 1
    New Member
     
    #7

    Mar 16, 2011, 04:10 PM
    Usually a circuit breaker is rated for 80% for continuous loading. Therefore at 120 volt circuit
    120 X 20 X 0.8=1920 watts. For 240 volt circuit of 240X20X0.8=3840 watts. All calculations for a single pole breakers
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
     
    #8

    Mar 16, 2011, 05:40 PM
    Quote Originally Posted by iceqube View Post
    Usually a circuit breaker is rated for 80% for continuous loading. Therefore at 120 volt circuit
    120 X 20 X 0.8=1920 watts. For 240 volt circuit of 240X20X0.8=3840 watts. All calculations for a single pole breakers
    First off, you are aware that this thread is well over two years old.

    Second, how can you say "All calculations for a single pole breakers"? And how are you getting a 240v circuit from a single pole breaker? The amount of poles is irrelevant.

    Lastly, there is very little in a residential setting that is a continuous load, excepting of course things that are required to be considered a continuous load, such as an electric water heater.
    dearman's Avatar
    dearman Posts: 1, Reputation: 1
    New Member
     
    #9

    Jan 12, 2012, 01:10 AM
    1 amp is equal to 120 watts,
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
     
    #10

    Jan 12, 2012, 04:29 AM
    Quote Originally Posted by dearman View Post
    1 amp is equal to 120 watts,
    First off, you are aware that this thread is almost a year old?

    Second, what you wrote is meaningless without all the parameters.
    Your statement is not accurate unless you include the voltage.

    1 amp is equal to 120 watts @ 120v
    Or
    1 amp is equal to 240 watts @ 240v
    Or
    1 amp is equal to 12 watts @ 12v

    Get it?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
     
    #11

    Jan 12, 2012, 07:41 AM
    Might as well add 1 volt @ 1 amp equals 1 watt.
    zaheeruddin's Avatar
    zaheeruddin Posts: 1, Reputation: 1
    New Member
     
    #12

    May 29, 2012, 10:54 AM
    Hi dear how are you ?
    sir I want to know how many amperes in one kilowatt /1000 watt ?
    pl z tell me conform report---------- thanks
    [email protected]
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
     
    #13

    May 29, 2012, 11:12 AM
    See previous answers and Ohm's Law.

    Need to know voltage to complete calculations.

    P=EI
    I=P/E

    1000 watts divide by 120 volts = 8.33 amps

    Or

    1000 watts / 230 volts = 4.35 amps

    You should be able to take it from here.
    shake's Avatar
    shake Posts: 1, Reputation: 1
    New Member
     
    #14

    Jun 24, 2012, 06:46 PM
    First off, I am are aware that this thread is whatever old.

    Second off, you sound like a total dink (not to be confused with dlink, the router). You didn't even contribute to this thread when it WAS "new". You only replied after the "old" repliers, making your posts even older than theirs. Bam.

    Who says old discussions are bad discussions? Anyway.
    ssdpa's Avatar
    ssdpa Posts: 1, Reputation: 1
    New Member
     
    #15

    Aug 17, 2012, 08:29 AM
    Amp * Volts = Watts
    1 * 220 = 220
    1* 12 = 12
    200 * 12 =2400
    *****LINK REMOVED****

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

800 lux to watts? [ 1 Answers ]

if we need to design lighting for any area with 800 lux, how many bulbs of say 60 watts we need to put per 100 sq.ft?

Watts to volts [ 3 Answers ]

How many volts are needed to wire several fixtures that total 540 watts. Will a 20 amp breaker handel this.

How will I know how much watts a transformer must I use [ 2 Answers ]

I have a 110v circular volt and jigsaw equipment but there are no 110v sockets available at the house. How do I compute for the transformer capacity?

Watts to amps [ 1 Answers ]

How many watts can a 10 amp lead carry?

How many watts per amp [ 2 Answers ]

What is formula to determine how many watts per amp. I have an RV with a 750 watt inverter and want to know how much wattage vs volts the inverter is charged with my Onan 5500 generator or my Honda 1000 generator


View more questions Search