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Making strong electromagnets 1 8Jc(2) Name Class Date How can you make a strong electromagnet? There are three things that you could change to alter the strength of an electromagnet: • the number of coils of wire • the current flowing • the core. 8 J c Prediction I think that if I have (more/fewer) coils of wire, the electromagnet will be (stronger/weaker). I think that if there is (more/less) current flowing, the electromagnet will be (stronger/weaker). I think I can make an electromagnet stronger if I use a core made from . This is because . Apparatus • • • • • • • • • Care – the wire will get hot! insulated wire connecting wires power pack ammeter two crocodile clips paper clips iron rod or nail glass rod wooden rod or pencil core INS MA Method Here is a diagram of the apparatus you will use. Label the diagram using words from the apparatus list. A LTA VO 5 GE 6 8 4 RE 3 5A 2 5A T SE .c. xd ma .c. xa ma Test A: Number of coils of wire To make this a fair test I must keep the and the the same. Page 1 of 3 Exploring Science M10_EXSC_CM_Y8GBR_2506_UJ.indd 457 edition 457 © Pearson Education Limited 2008 21/8/08 15:26:20 Making strong electromagnets 1 (continued) 8Jc(2) Method A Make an electromagnet with 10 coils of wire and an iron core. B Switch on the electricity and see how many paper clips the electromagnet picks up. Switch off again and write your result in the table. 8 J c C Repeat steps A and B for 20, 30, 40 and 50 coils of wire. Keep the same setting on the power pack each time. Recording your results Number of coils Number of paper clips picked up 10 20 30 40 50 Considering your results/conclusion When there were more coils of wire, the electromagnet picked up (more/less) paper clips. The more coils of wire, the the electromagnet. My prediction was (stronger/weaker) (right/wrong). Test B: Current You can change the current by changing the voltage. A higher voltage will give you a higher current. Your teacher will tell you which voltages to use. To make this a fair test I must keep the the same. and the Method A Make an electromagnet with 20 coils of wire and an iron core. B Switch the voltage to 1 V and switch on the power pack. Read the ammeter and write the current in the table. C Find out how many paper clips the electromagnet will pick up. Switch off again and write your results in the table. D Repeat steps B and C for the other voltages. Page 2 of 3 Exploring Science M10_EXSC_CM_Y8GBR_2506_UJ.indd 458 edition 458 © Pearson Education Limited 2008 21/8/08 15:26:21 8Jc(2) Making strong electromagnets 1 (continued) Recording your results Voltage (V) Current (A) Number of paper clips picked up 8 J c Considering your results/conclusion The higher the current the My prediction was (stronger/weaker) the electromagnet. (right/wrong). Test C: Core material Planning 1 In your book, describe how you would investigate what happens if you change the material the core is made from. 2 Write down how you will make sure your test is fair. 3 How will you make sure that your test is safe? 4 Show your plan to your teacher before you start. Recording your results 5 Draw a table in your book to record your results. Considering your results/conclusions 6 Write down what you have found out. 7 Describe how you could make the strongest electromagnet possible from school equipment. I CAN... • carry out a fair investigation • make careful and accurate observations • draw a conclusion. Exploring Science M10_EXSC_CM_Y8GBR_2506_UJ.indd 459 edition 459 Page 3 of 3 © Pearson Education Limited 2008 21/8/08 15:26:21