 Gross looks like it might be a good day to do some inside work and I've been meaning to get to this video anyways so let's get to it. Okay so this is one of those videos I've been meaning to do for years like literally years but I think probably since I started this YouTube channel I've been meaning to get to this one but I never really knew how to do it because I didn't really have the technology to do a whiteboard and to do like face-to-face it didn't have I didn't well maybe the technology was there but to be honest I didn't know how to do it. I got there now I can do both and so what we're gonna do in this one is we're gonna talk about the left-hand rule for coils and talk about how we can determine our north and our south polarity for a coil but also how we can work backwards and reverse engineer that and we can use the north and south to determine the polarity of the coil itself. Now this is not to be confused with the magnetic field left-hand rule which is this one here where this is the way that current is flowing and this is the direction of your magnetic field in fact maybe I'll do a video up on that after this one right now we're gonna talk about the left hand rule for magnetic coils not to be confused with Faraday's left hand rule like this the new gang sign that I did a video on a few weeks ago. This is a completely different one this is all to do with basically electromagnets so let's get busy and talk about it. Now what we've got it's important to understand here I'm talking about the left-hand rule because I'm dealing with electron current flow for all of you people who keep saying that I've got it backwards you're dealing with conventional current flow you're saying that current flows from positive negative there's something else out there just so you know called electron current flow negative to positive which is why I use the left hand if you follow conventional current flow go ahead and use your right hand but just make sure that you haven't understanding why you're using what electron current flow here when we're talking about it in electrical theory we're going with current flows from negative to positive okay now here's my hand my electron current flow is my left hand when I talk about this left hand rule my thumb always points north that's easy enough to do that's pointing north no matter where my thumb points that would be north that would be north that would be north no matter where my thumb points to it's always going to be north okay my fingers however are the way that the current wraps around now current flows from negative to positive meaning current flows from like my knuckle over to my my fingers are now I'm just going to just my ISO here seems to be I can't adjust my ISO so I guess I'm just going back here like this can't do it on the fly now what does this all mean I'm going to go us send us into the whiteboard to talk a little bit about it now I have had some people complain that they prefer it when I just have the whiteboard on some people some people like this new format for this one I'm going to have to jump in and out of the whiteboard because I need my left hand all right so that that's why we're going to go back into the whiteboard you people who like to see more whiteboard I hear you okay I'm coming back to that I promise but this one we need this hand here okay so I'm going to go into the whiteboard here if I'm in the whiteboard and I draw like a core so let's say I've got a nice core drawn here and then I've got let's say I'm going to change my color up here I've got a coil wrapped around this core so I've got this coil wrapped around here and let's say that I've got my polarities figured out this is negative this is positive when I deal with this the negative is always going to be your reference so when I look at this drawing here what I've got is my negative is going over top so if we look at this the negative is going over top the way I look at it using the left hand rule is I see the back of my hand whenever the negative which is my reference point goes over top that means I see the back of my hand because my hand is wrapping over top of the coil that means that this one here this here is going to be north because that's the way my finger points this one here is going to be south okay now let's change that up let me show you what I mean I'm going to erase this and this erase this and this now on this one if I go the opposite direction say this is negative now and this is positive you can see that the coil wraps underneath because again negative is always our reference point on this we follow electron current flow it's going underneath when I do that it's like I'm looking at the palm of my hand because it's wrapping underneath something use this a pen or whatever as a core it's wrapping underneath so I'm looking at the bottom of my hand if it went over top I see the back of my hand okay that to me tells me that my north pole is now this direction and my south pole is that direction that's how we do and how we do how we determine the north and the south pole based off of polarities okay so if if you need to please hit pause on the video rewind it back and watch it again right instead of me just repeating the same thing I just said but watch for that just hit pause until you get your head wrapped around it because right now what I want to do is give you the north and the south pole and show you how we can determine polarities okay watch this now you have to understand the first part for this to work so rewind if you have to come on back I'll be waiting for you okay let's get rid of these polarities let's take this here and I'm going to give this a let's say this is north and this is south if I'm looking at this coil the only way that the north and the south works is if my hand is like this okay my thumb has to point to the north that means I'm looking at the palm of my hand unless your hand is some sort of different type of hand that I don't have you're looking at the palm of your hand which means that your current is going to go underneath you're going to look for the wrap that is going underneath and that's going to be your negative point so let's take a look here if I look at this drawing here the point whoops I just erased something didn't mean to the point that is underneath is right here because I was looking at the palm of my hand that tells me that this here is going to be negative and this here is going to be positive let's flip it around and show you what I mean just to make it finish this up and wrap it up nicely now here we go let's make this south and this north if I do that I'm putting my hand on top because my hand has got a fault my thumb has got to point to that north follow along with me you'll get this which means I'm looking at the back of my hand which means it's going over top of something right it's going over top if it's going over top that is the negative the negative lead that goes over the lead that goes over top is my negative lead so let's take a look at the drawing again this is the one that goes over top because I'm looking at the back of my hand that means that this now is going to be my negative and this is going to be my positive and there you have it that is exactly how you use the left hand rule for coils to determine first off your north and your south pole thumbs always north and then this is always the direction of current direction of current we're using left hand rule which means we're going negative to positive we can also use that rule to determine north and south or sorry to determine polarities if we have north and south that's it that's gonna be a quick and easy one for this week I apologize that I didn't get one out the past couple weeks some of you know that I've been working on my masters in learning and technology and I ramped up I was just at the point where I had to do what's called a oral defense I did it I passed it I am now a master just I've got my masters which I'm very very excited about and I've got some other big things up coming up so I'll mention those talk about those in the future you didn't watch this vlog or this video to hear about my future or to hear about me getting my masters you wanted some good solid information boom there you go if you have any questions at all please feel free to reach out to me and put a comment up down below I try to get to them I don't always get to them right away but I will get to them eventually we'll see you next week I'm done my masters so you're gonna see more videos see you soon