 In this video I'm going to be walking through how to determine what the volt drop is across a break in the neutral That's what that little X is there We're going to talk about how that's going to change voltages and there's going to be a voltage difference across that break So the first thing we got to do is we've got to look at this circuit a little bit different with this neutral here We would have 120 volts here 120 volts here. We still have 240 volts across the whole thing and 120 volts across this guy Now with this neutral broken though We don't have this line here anymore. So let's redraw the circuit a bit. I Have taken out the neutral right in this area here because it's not there anyways And we're gonna need to do that anyhow in order to determine what the volt drop is across these guys in this guy Now we don't actually even concern ourselves with this 50 ohm resistor because he is if you notice He doesn't use that neutral. He's connected line to line So this guy gets 240 volts no need for the neutral So when we're trying to calculate that break that neutral break We actually don't even need this guy in the circuit at all. So let's get rid of them All right, our circuits getting a little easier to look at now We've got this guy this 30 ohm resistor and this 45 ohm resistor are in parallel with each other and in series with this 25 ohm resistor. So let's get rid of the rest of this and see how it looks Now we've got ourselves a branch circuit that's getting easier and easier to deal with What I need to do is I got to take these two guys this 30 ohm resistor and this 45 ohm resistor and crush them together And I'm gonna do that by adding them reciprocally 1 over 30 plus 1 over 45 equals 1 over the answer That's gonna give me 18 ohms of resistance so those two guys crushed together gives me 18 now I have 18 in series of 25 Well, we're just gonna go ahead and add those because those are two resistors in series Which gives me a total branch Resistance of 43 ohms now we know that if we have 43 ohms that we would have 240 volts across those 43 ohms So what we need to do now is get the branch current What we're gonna do is just do 240 divided by 43 and we're gonna get the current through that branch 240 divided by 43 ohms gives us 5.6 amps. So you've crushed it down to this one resistance Let's start spreading it out again. I got 5.6 amps on 25 ohm resistor. That gives me a hundred and forty volts across this resistor here I've got 5.6 amps across the 18 ohm resistor that gives me a hundred volts roughly about there So now what I'm gonna do is I'm gonna spread out again. I'm gonna look at we had this one guy on its own We're gonna take it back this 18 ohms remember is The 35 and the other one 25. I think it was 25 in parallel with each other So we're gonna spread those out again Whoops that was 2045 sorry So now I've got a hundred volts across that and a hundred volts across that resistor because we know that Resistances in parallel do not change and we're gonna start putting this back into the circuit that we had before So see we're starting to just we crushed it down one way and we're bringing it back the other so now we're Put in this circuit as it was 140 volts there hundred volts there hundred volts there Let's add on that 240 volt load just to see what the picture looks like So I've got a hundred volts across there hundred volts across there 240 volts It's not affected at all by that neutral 140 volts there so let's throw that broken neutral in there and figure out what we've got Okay, so let's start on one side We're gonna start on this side and work our way around to this side now I'm gonna use this winding first and then I'll use this winding to confirm Now let's start here. So I start here and I pick up 120 volts and then I drop 100 volts that leaves me with a net voltage or difference of potential across there of 20 volts So let's confirm that though because whatever it is on this let's move that back Whatever it is on this side It's gonna have to work out to be the same on this side. So we start on this side here Let's start and we pick up 120 volts and we drop off 140 volts So 120 minus 140 gives me 20 volts as well So we've just confirmed that the break the voltage across this break here Whether it's this way is 20 volts and this way is 20 volts. That's all we have to do remember We have to just start Breaking it down into different parts. We take this guy here and turn it into its own branch circuit We disregard this guy because it is 240 volts and does not require a neutral and that's it I have to do is you break it down you get it right down to this final resistance Get the current and then work itself back up getting your volt drops across all the resistances And then you just take your rise of 120 volts and figure out where your volt drop is there And it should equal the rise of 120 volts Minus the volt drop there as well and that's how you determine the voltage across the neutral break