Still comes up to 54.34AI think you need to include √3 in your calculation since this is 3-phase.
only had 31.41,54.35or 163.04 to chose from not 31.35 to choose fromThis is what I get:
\(\frac{25000W}{\sqrt{3}\ast460V}\approx31,34A\)
Those two answers only differ by 0.2%. What more can you expect, especially when odinhg indicated that the answer was approximately 31.34A.only had 31.41,54.35or 163.04 to chose from not 31.35 to choose from
Why wont this formula work P = I*V, so 25,000W = I * 460v? The answer comes up to 54.35AThose two answers only differ by 0.2%. What more can you expect, especially when odinhg indicated that the answer was approximately 31.34A.
Current draw depends on the power factor, power load and voltage.25kW operating across a balanced three-phase 460v what is the current draw?
I came up with 54.35A
this was the formula we were shown and is different that what you all have shown me. kw*100/1.73*e*PFBecause that formula applies to a device in which you have two terminals across which V appears and the I going in one terminal and out the other. It also assumes that the V and the I are in phase.
With a three-phase netwrok, you have three terminals. Across any two of them you have V (but the pairs have phase shifts of 0, +120°, and -120°). This means that you have three supplies dumping power into it. But the reason why the total power isn't 3VI is because the voltage and the current aren't in phase on any pair of legs.
Work through the analysis on either a delta or a wye connected load and you should see how it works out. In particular, focus on the relationship between the line-to-line voltages compared to the line-to-neutral voltages.
The answer came out the same so both equations worked. Schools not the answer its who you know. Thanks again for your help and I learned soething as wellPerhaps you should consider changing schools and going to one that is actually going to teach you correct information.
Didn't one giver you 54A and the other 31A?The answer came out the same so both equations worked.
I don't follow. If you believe this, then why are you in school at all? Or do you figure that all you need to do is get a piece of paper and then rely on getting someone to do a favor for you and give you a job?Schools not the answer its who you know.
Your welcome, and I hope so.Thanks again for your help and I learned soething as well