I am trying to figure how many watts a 20 amp circuit can carry.

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

2400 watts. Derated 1920 watts, I forget the rules for derating.

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.

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

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.

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

Quote:

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Originally Posted by iceqube

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

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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.

1 amp is equal to 120 watts,

Quote:

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Originally Posted by dearman

1 amp is equal to 120 watts,

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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?

Might as well add 1 volt @ 1 amp equals 1 watt.

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]

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.

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.

Amp * Volts = Watts
1 * 220 = 220
1* 12 = 12
200 * 12 =2400
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