Lesson video

Hello, everybody! Welcome to your final lesson on magnetism with me, Miss Roberts! I've really enjoyed this unit on magnetism, and I hope you have too.

I've learnt so much about magnets, my mind has been blown, so many lessons, and I'm sure you've heard it in my voice.

I hope you've enjoyed this unit as much as I have, and I can't wait to do our final lesson today.

We're going to think about what are some uses of magnetic materials.

We'll find out more in a moment.

Before we do though, let's do a quick recap from the last lesson where we learnt about field lines.

What were the two ways that you could make field lines visible because we said field lines are invisible.

But we made them visible.

What were those two ways? Can you remember? Tell your screen as soon as you remember and I'm going to show you some clues on the screen.

That's your first clue and that's your second clue.

How did we draw those field lines last lesson? We used a compass, well done.

And then what's the other way that we could see them? When we scatter, what do we scatter on top of the magnet? Well done, iron filings.

Wasn't that amazing? Okay.

If you want to today, you can go and get the resources that you need and your favourite teddy.

I've got Lenny the lion here as ever and he is really excited to listen to the final lesson on magnetism by my screen.

You're definitely going to need a pencil, a pen, a ruler, and a notebook.

If you want to, you can get a magnet.

Pause the video and go and get the resources you need now.

Okay, so in today's lesson, we are going to do the following.

We're going to look at our STAR words.

Then, we're going to learn about what is an electromagnet, uses of electromagnets, and then have a look at an investigation.

You're really going to like this one.

And then, as ever, I've got a think question for you.

So, should we get started? I said, shall we get started? Okay, let's go, team! So, my turn, your turn.

STAR words, STAR words, STAR words! Well done! There are two on the screen.

What are the actions? Well done! Attract and repel.

You know those ones really well already.

Let's look at some other ones.

So this one is electromagnet.

So I'm going to wiggle my fingers around like a coil.

You'll learn why later.

Electromagnet.

Can you do that one? Well done! I love your actions, team.

The next one is force.

Your turn.

Permanent.

Your turn.

Temporary.

Your turn.

Well done! So, making an electromagnet.

First of all, let's have a think.

Last lesson, we began to see ways in which magnets can be useful.

But it would be particularly useful if we could turn a magnet on and off.

My bar magnets cannot be turned on and off.

They are always magnetic.

So no matter where I put it, it's going to be attracted to magnetic materials.

If you build an electromagnet, it is possible to create a magnet that can be turned on and off.

On the screen there's a light bulb.

This is not powered by electromagnetism but we can turn bulbs on and off, and it's really useful.

For instance, when we want to go to sleep or if we want to save energy, we can turn the bulb off.

This is a really useful part of having a light bulb.

And it's the same with electromagnetism.

You can see on the screen a coiled piece of copper wire.

And I'm going to talk you through why this is useful in a moment.

As you can see on the screen, the electromagnet has three different parts.

There is a coiled wire that goes around a piece of iron.

The magnetic field can be channelled through the iron because it's being powered by a battery.

So, you coil the wire around the iron and then you connect each side to a battery.

This can then act as a switch and it can be turned on or off, depending if it's attached to the battery or not.

Isn't that amazing? So we thought about being able to switch electromagnets on and off but what are the uses? What have we found useful ways to use electromagnets? So if you've ever been to a hotel before, you may have used a keycard, and this is a bit like a credit card.

It's a piece of plastic that you put into a door.

This then unlocks the door, and it does this by electromagnetism because inside the card will be a magnet that is then connecting the circuit of electromagnetism.

Then unlocks the door.

And it saves you having to use a key.

Isn't that amazing? Another use of electromagnetism is cranes.

They can transport really heavy metals.

You can see on the screen there a crane with lots and lots of metal attached to it.

Like I've said, it can be used to carry heavy things.

Also, it can sort things in recycling.

So if you put an electromagnetic crane into some recycling, what materials will it pull out? Can you tell your screen? Well done! It'll only pull up the magnetic materials, and that'll be really useful for sorting recycling materials.

Let's have a think.

How well were you listening? A few questions for you before we carry on.

Question one.

What can you do with an electromagnet that can't be done with a normal magnet? What are two uses of electromagnets? I just showed you them on the screen so see if you can think really hard rather than going back.

And, how is the wire shaped in a simple electromagnet? For that one I'm going to give you a clue because our STAR word action was electromagnet.

So, have a go at writing the answers down in your notebook.

And pause the video if you need more time because I'm going to go through the answers.

Okay, question one.

The difference between a normal magnet and an electromagnet is that an electromagnet can be switched on or off.

The two uses of electromagnets that we have talked about is the electric lock.

If you said keycard that would be okay.

Or a crane that collects heavy metals.

The wire in a simple electromagnet is coiled, and that's why we do our action like this.

Like a coiled wire.

I'd like you to tick the ones that you got correct.

And if you got any wrong, that's okay.

You can just write the correct answers down now so that you've got them in your notebooks.

Well done, team! You're working really hard this lesson to learn all about electromagnetism.

So, shall we have a watch of somebody making an electromagnet? 'Cause I've only shown you a very brief, simple example so far.

Would you like to see it? Oh, you wouldn't? Oh, you would? Okay, let's take a look at an investigation.

Once we've watched this investigation, I'm going to ask us to write it up, of how you make an electromagnet.

If you've not done the practical skills unit so far, then I suggest you go and have a watch of those lessons, particularly of how to write up a method because that's what we're going to do today.

So, let's have a watch.

So you can see that this person has a very thin copper wire.

Then, they've coiled it around the iron nail.

Now you can see that they've not done it loosely.

They've not done it just haphazardly.

They've done it very, very tightly around the nail.

This nail is made of iron which is magnetic, and that's really important.

Then just on the ends of the wire, they're just scrubbing it off to make sure that all of the wire is exposed.

So you can see now that it's ready.

There, they've got a battery and they're just attaching a rubber band around the battery to hold everything in place.

So they're going to attach one end of the copper wire to one end of the battery and the other end of the copper wire to the other end of the battery.

So now electricity is running through the copper wire and is making the nail into an electromagnet because it's magnetism made by electricity.

And there! You can see that the iron filings are sticking to the end of the nail.

And there you can see that the safety pins are also sticking to the ends of the nail, which shows you that that nail, which wasn't magnetic before, is now turned into an electromagnet.

Wow! Wasn't that amazing, team? Who would've thought that a normal magnet like this bar magnet could also be made by electricity? So, let's have a think.

What was the equipment needed? When we write out an equipment list, we always use bullet points.

As you can see on the screen, this is not an equipment list for an electromagnet.

This is from a plants experiment.

One seed tray, seed compost, tomato seeds, and water.

That wasn't how they made the electromagnet.

I'd like you to now write down the equipment list for the electromagnetism experiment that we just saw.

What were the three things they used? They used, can you tell me one of the things? Well done.

They used a thin copper wire.

What did they wrap that around? Well done, an iron nail.

And then where did they get the electricity from? Well done.

They got it from a battery.

So those were the three things I want you to write down in your notebook using bullet points.

Not numbered steps.

Bullet points.

Have a go now.

Okay, so now we've written our equipment list down, we're going to write out the method.

Now again, this is not the method for our experiment.

When we write out a method, we want to think carefully about how we write it.

In purple, you can see there are numbers because you have to carry out a method in the order that you have to do it.

For instance, if I said test the nail with the iron filings first, then it wouldn't work because you haven't made the magnet yet.

So, you need to write it in numbered steps.

Then, you'll also see a green highlighting.

The green highlighting is over the words first, and what's the other word it's over? Can you tell your screen? Next, well done.

And these are examples of adverbs of time.

And adverbs of time tell us which order to do things in.

For instance, first.

That tells us that it's the first thing to do.

Next tells us that we need to do it next.

So we should've already done something.

I want you to use adverbs of time when you're writing out your method.

Then, you'll notice that there are some pink writing.

This is because we need to use verbs to tell somebody what we did.

Sprinkle the seeds, place the seeds, and spray the seeds.

So those are verbs that we're using.

In which tense? Are we talking about the past tense, the present tense, or the future tense? Well done.

It's the present tense.

So we write our verbs in the present tense.

I'd now like you to have a go at recapping all of the features of a method.

Can you read what it says in the arrow? Well done.

The underlined method.

What's the next thing? Well done, adverbs of time.

Numbered steps, well done.

And present tense.

So now that you know how to write a method, I'd like you to have a go at writing out the method for the electromagnet.

If you need to, you can skip back in the video and re-watch how that person made the electromagnet because it did go quite quickly.

I've given you the first step to help you, and it reads as follows.

First, tightly coil the wire around the nail.

That would be my first step and you can borrow mine if you want to.

Now I'd like you to have a go at writing out the rest of the method.

So pause the video and have a go.

Okay, well done, everyone! I am really impressed with how well you wrote out that method.

I hope you had a go.

Make sure that you don't use the method to make your own electromagnet unless you have an adult present with you.

It's really important that you keep yourself safe so they need to be able to know what you're up to.

So please ask a grown-up.

Okay, this is the final part of our lesson and the final slide for our whole unit of magnetism.

I've got a think question for you.

Why might it be difficult to use a permanent magnet on an electronic lock? Why would it be difficult to use a permanent magnet on an electronic lock? So for instance, if you use a magnet on your lock on your door but it's permanent, what would that mean? Does that mean you can unlock it? That might not be difficult.

I'd like you to have a think about your decision for this think question and then as ever, I'd like you to speak to somebody, either at home or at school.

You could ask your adult, you could ask your friend, or your brother or sister, or somebody at school, and have a scientific conversation about what you think the answer is.

I am so proud of you for all of your learning on magnetism, and I know that Lenny the lion is as well.

We've really enjoyed teaching you all about magnetism and I hope you've learnt lots.

Well done, everyone, and I can't wait to see what scientists you grow into in the future.

Bye, everybody!.