Welcome to How resist is to use part five. Let's go on to the next slide and talk about rheostat. And we're talking about rheostat. Here we are right here. And see if my pen works. It does.

That's a good thing. Okay. rheostat. And if you look at the difference between a rheostat and a potentiometer, it's actually this right here. All right, it's a shot. It's a shot between the center arm right here.

And one of the terminals in this example, it's, it's seat a right seat A. So let's just go to the next slide. You'll see what I mean. All right, there's a potential iometer if you look, there's no shot from A to C or from BTC. So let's go back to that. Let's go back to that slide.

And let's clean the, let's clean the markings. And we're gonna look at this guy here, the first one. Okay, so resistance rotating the shaft fully counterclockwise. So that means if I rotate the shaft fully counterclockwise, we have this. So this is not in the center anymore. It's actually at the end.

All right. So what we say here is from C Right there from C to B is 10 K. And from C to A zero Well, it has to be, it's a shot. Okay, there's a shot right there. It's a piece of wire. So when the, my shaft is fully counterclockwise, okay, and here's the shafts here, here, here, here, when they're fully counterclockwise, this is what I get. CBS 10 K and C days zero.

All right, let's look at the other one. Let's, let's clean it off and go to this one here. All right, so when I rotate the shaft this way, like I'm showing you here, clockwise 25%. So now it's approximately here. All right, from C to B. It's 7.5 K or 7500 ohms.

But still see today because of this shot here is still zero ohms. And let's get rid of that. All right, let's do the the middle one here. And I think you'll get the idea of this one here. All right, this is what I'm showing you here. So this is, this is in the center right here.

All right, and again, see to be alright, since the whole part here is 10 K, we're in the middle. So that part of the resistor and it's adjustable is five K. However, because Have this shot, seat a is zero. All right, let's do the last two real quick. I think you should, I think you should kind of see it now if not, you've got my numbers. You've got my email and my phone number previously to give me a call. We'll go through it.

All right, so now let's go to the third one. All right, when I take the shaft, and again, we're not looking at it here, but it's approximately there. Alright, see to be this way. 2.5 K. However, what C to A still got that shot there. It's still zero. And the last one.

Let's get rid of it. The last One when this let's get rid of this is right here. Okay? resistance rotate 100% clockwise. Here we are. Okay C to B, zero, and C to A zero.

So now we have a shot. That's a potential ometer. All right, we can take I'm sorry, that's a rheostat. I apologize. That's a rheostat. So now, if you look at these, these are potentially ominous.

That's a potential winner, that's a potential ometer. I can take a potentially armor and just put a shot in between one of these two, right, that now becomes a potential ometer over here, here and here. They are done internally. Okay, so the manufacturer has done that internally. But quite honestly, most most The ones that I've seen they take a potentiometer. They put a, a shorting, shorting bar or shorting wire between two of the terminals and it works.

I mean that's that's pretty much it. So let's, let's see what's going on. Let's get rid of this. And let's go to the next slide. Okay, this one here I used as a review for a potential ometer. All right, let's erase that.

And let's go to the next one. Okay, now we have very special types of resistors they call baristas, and thermistors Okay, all right. arrestor is a vein resistor, whose resistance depends upon the applied voltage, also known by the name vdr, voltage dependent resistance vdr stands for voltage dependent resistor. When the voltage across it increases, the resistance decreases, used in over voltage protection. That's all I'm going to say about this here. We're going to do a, a video in a lesson on overprotection, over protection voltage circuits.

And we'll see we'll go into detail how that works. Okay, what is the thermistor a thermistor is a component that has a resistor that changes with temperature, all right, there there are two types we can get a thermistor where as I increase the temperature, the resistance increases. Or when I decrease the temperature, the resistance will increase. So they can, it can can be one or two one is the resistance follows the tempo change. And one is when the temperature goes up, the resistance goes down. And when the temperature goes down, the resistance goes up.

And it really depends upon it really depends upon the circuit application. All right. And again, when we get into circuits, we'll show you some. Okay, let's go to the next one. And basically I just wanted to do here, just a quick review. Okay, this is a potentially ometer.

All right, we can go 270 degrees from okay maximum. So when we go to clockwise, to counter clockwise, we have a rotation of a standard potentiometer of 270 degrees. All right. We can Get a multi turn potentiometers. Where, if you look back here, let me go back real quick. Okay, where it may, it may take, it may take five turns to go from one end to the other by 10 turns going from one end to the other.

All right, but but this is a standard potentially ometer 270 degrees. It's great. We use these in voltage controllers, all kinds of applications, we know that the resistance on the outer terminals affects all right, and if I want to make a potentiometer, I'm sorry if I want to make a rheostat. I just shot to these terminals and now it's a rheostat