 In this video, I want to discuss how you calculate for power in a delta configuration. There'll be other videos on how to calculate power in a y configuration, but in this one we are going to deal with a delta one and not a grounded system, just a completely ungrounded delta system. So here we have, starting out with our basic delta configuration. Here we have our three windings that are a whole 120 degrees at a phase. Notice that there is no ground point at all on this. You can have a grounded corner point, but we're not going to discuss that or you can ground a center tap here. Again, that is another discussion for another video. But in this discussion, we're just going to be looking at how we calculate the power from this transformer. And the reason why I say it's a transformer is you can tell by the coils here as opposed to the resistors, which would denote some sort of load. Now just off the top, if we're calculating power in a three phase delta system, there's two formulas we can use. We can use VA, which is power, is root three or 1.73 times E line times I line. So we're going to need to learn how to calculate the E line and I line, which you have done from other videos, I'm sure, but we'll go over it again in this one. Or you can use the formula VA is equal to three times E phase times I phase. Anyway you look at it, you're going to end up with the exact same answer. Now let's get started. So I turn this transformer on and right now, just for simplicity sake, I'm going to use easy numbers. I know 120 is not a very common three phase voltage, but just it's a common voltage for us to use. So I'm just going to say I've got 120 on this phase, 120 on this phase, 120 on this phase, which will give me 120 on this line, 120 on this line, 120 on this line. So in a three phase delta system, your E line is equal to your E phase. So your voltage across the phase is equal to your voltage across the line. So let's put that off off in the corner here, E line is 120 volts, E phase is 120 volts. Now let's say that down the line here, we've got a load that is drawing 10 amps from each of these windings. So we now know that the line or sorry, the phase current is 10 amps, but when we're discussing the current for the line, it's going to be different because we have this current coming to this point and this current coming to this point at different angles. So we have to add them vectorially covered in another video, but we know that this current in this current is not going to equal 10 amps on this line. So we do know that we take this current times this current, sorry, this current times root three 1.73 and you'll get your line current, which is in this case, 17.3 amps. So now we have our I phase, which is 10 amps and our I line, which is 17.3 amps. So I line, let's put this off on the corner here is 17.3, I phase is 10 amps. So now what we can do is we can use those formulas that we talked about earlier in the video to see if they all come out to be fairly close to one another. So let's take VA is equal to 1.73 times E line times I line, E line 120 times 17.3 times root three will give us our answer. And there we go. We end up with roughly 3,600 VA 1.73 times 120 times 17.3 gives us 30,591.8 VA. But for all intents and purposes, let's just kick it up to 3,600. So let's use this formula. The VA is equal to three times E phase times I phase. So let's take three times 120 times 10 gets you a 3,600 VA. So we've just basically proven, I know that you're going to argue with me over these, what does this work out to be nine amps or nine VA? But trust me when I say that 3,600 VA and 3,591.8 VA are pretty well the same thing. So there you go. We've walked through how to calculate power on a Delta system. There's two ways you can do it. VA is equal to E line times I line times root three, or VA is equal to three times E phase times I phase.