Let's find out, grade 2; Magnets and electromagnets

Now when my two boys and girls to listen I'll draw a science lady brings you another program. Hello boys and girls. How many of you have ever seen a magnet. Good how many of you have ever used a magnet. Some magnets are shaped like a horseshoe are they. And some magnets are a straight bar. A magnet will attract things made of iron won't it. A magnet will pick up or stick to anything that is made of iron ore that has some iron in it. You remember about that don't you. Good. Well today we're going to find out about another kind of magnet and elect troll

make. Have you ever heard that word before. An electro magnet a magnet that we can make out of the nail or a bolt an iron nail or an iron bolt. We're going to make a very small an electromagnet today. Are you ready to start. Mr Engineer. Do you have a large nail or a boat there on your table. Does it have a wire wrapped around it. When I listen carefully the wires should be wrapped all several turns around the nail to the long ends of wire sticking out from the nail. If yours does not look like that your teacher will help you fix it. A large nail or a bolt rather wire wrapped around it. Many wraps too long ends of the wire sticking out from either end of the

nail. Now when you have it fixed let everyone see it please. Are you ready. I hope so I think you had it ready before you even started this broadcast today. Now this electrician will you find the paper clips. Are there some tags and put them right out in the middle of your table so we can all see them. Put them in a pile right in the center of the table. Ready. Good. Mr Engineer Will you hold the ends of the wire in one hand so that they don't not get in the way and the nail wrapped in wire in your other hand. Now touch the paperclips or some tacks with the end of the nail either and will do. What happened. Does a nail pick up the paper clips are there some Dykes.

Ours didn't here in the studio. The nail did not pick up any of the paper clips or the Semtex did it. The nail is not a magnet but what would you say if I told you that you could make the nails act like a magnet that you could make it into a magnet for a minute or two. Rod you like to try Miss electrician. Find the dry I sell a large round Drysdale this dry cellar is just like one that you use in a flashlight except that it's bigger it's taller and bigger around this electrician do you see two small posts on the top on one end of the dry cell. Run should be in the center of the top and one out near the edge. Keep the dry cell

so that the children can see those two posts when you show it to them. Each one of them has a screw or a nut on it. Can you loosen the screw or the nut on the center post the one it's in the center of the dry cell. Unscrew it just a little way don't take it off. Just loosen it. Now Mr. electrician give Missa like Trish and one of the ends a wire in her hand. Miss electrician look at the very end of the wire is the bare wire sticking out. If it isn't Suppose you try to push back the covering so that a very short piece of the wire is bare teacher we may need your fingers to help here. Now when you have a short piece of bare wires sticking out. This electrician bend it make a hook in the wire in the end of the wire the

bear and just bend it over a little bit. That may not be very easy but the wire is not too hard is it to ban. If your teacher is there he may have to help you a little bit but I'm sure you'll be able to do it. You have a hook in the bare end of the wire. Good now Mr electrician you will have to move with the missile like Mr Engineer. I'm sorry Mr Engineer you will have to move with Mis electricians so the wire will reach this electrician put the hooked wire the little hook that you made in the end of the wire around the center post of the dry sail hook it around under the nut under the little screw nut. All right now screw the nut tight so it holds a wire on to that post. If he thinks that right now have you done that just right one end of the wire that it's wrapped around the nail will be attached to the center post of the dry

cell. Is yours faster now. Good now Mr Engineer. Give the other end of the wire to miss a lectern. Hold the wire in your hand Miss electrician but don't let your fingers touch the bare wire. Is there a little piece of bare wire on the end of this one too. All right when I hold it with your fingers behind the barrel and don't let your fingers touch the bare end of the wire. Hold it still and wait until we tell you what to do. Mr. engineer moved the paper clips or the Semtex close to the dry cell so that you can touch them with the end of the nail. Is the wire still wrapped around the nail. Good. All right Mr Engineer. Touch the paperclips with the end of the nail again. Well the nail picked up the clips. It isn't a magnet then is it. All right now take the nail away from the

clips Mr Engineer. This electrician listen carefully touch the end of the wire you have in your hand to the outside post of the electric cell the dry cell. Hold it there. Be sure to keep your fingers away from the bare wire and the post. Have you got it now hold it still right on the post. Now Mr Engineer touched the clips with the end of the nail again. What happened. Did the nail pick up. The clips are the tacks. Hold the nail up away from the table so we can all see the clips or the tags sticking to it. All right now watch carefully keep your eyes on those paperclips are some techs this electrician take the wire away from the post. What happened did the attacks or clips fall away from the

nail. Well let's try that again. This electrician touched the end of the wire to the outside post of the cell and hold it there. Mr Engineer touched the clips with one end of the nail. Can you lift some clips within a hour. Take the wire away Miss electrician. Oops Down dropped the tracks at the clip. What did you do to that nail. The Drysdale and the wire help you to make it into a magnet into an electro magnet. Now if you were not able to make your nail work today will you try again. If it didn't work try winding neural wire around the nail. Sometimes you will need more wire wrapped around the nail to make an electromagnet that will pick up tacks or clips you

want to try it once more. All right let's do it again. This electrician when you touch the wire that you have in your hand to the outside pose the electric cell. All right now Mr Engineer. Touch the nail one end of it to the clips or the tacks. All right move it over a little bit. Now now let go take the wire away Mr electrician and bang all the off the arm off don't they. All right well when you show the boys and girls in your room how to make an electromagnet. After the broadcast good put everything down on the table and let's all think. Could you make an electromagnet do some work for you. Great big electromagnets are used to do all kinds of work. Large electromagnets are used to load heavy scrap iron into

our onto a train cars. You see you can make the magnet a magnet for just a little while as long as the electricity is running through the wire. The nail is an electro magnet but when you disconnect the wire no more magnet and so it drops its a road. There is no electro magnet in a telephone in an electric clock. Some of the toys you have at home have electro magnet in them. Did You Know That. Will they do. But will you promise something will you promise me that you won't try to find electromagnets in clocks or telephones. Because if you did you would break the telephone or the clock and then it wouldn't work any more. Perhaps your teacher will find a picture of the inside of a telephone to show you and then you can see

what a real electro magnet looks like. Perhaps you can see an electromagnet in some of the toys you have at home. If you have an electric train turn it upside down and see if you can see it inside. In some of them you can if you have a little truck that runs by electricity. Turn it over and see if you can see in some place. Some of them are not covered up and you will be able to see them. But don't take things apart unless you ask permission. We must not take things apart or we may break them and then they won't work for us. But you find pictures of electromagnets and maybe you could see a big electromagnet loading scrap iron onto a train. If you go to the right place. You could try making an electromagnet to load a box with some text or paper clips. And then you would know just how the big ones work in

loading heavy scrap iron onto railroad cars. And I Lectro magnet works only when electricity is moving in the wire. Well you talk about that and will you make some electromagnets and when you move to some other things. If you or electromagnet didn't work today. Try using a longer piece of wire and wrapping it more times around the nail when you try to make another electromagnet and make it work. Right side by. Let's find out in the studios of the St. Louis Board of Education radio is there. This is the Emmy B Radio Network

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