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Transcript
Electromagnets Experiment How can you make a strong electromagnet? There are three things that you could change to alter the strength of the electromagnet: o The number of turns of wire o The current flowing o The core Prediction I think that if I have _________ (more/fewer) turns 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 the electromagnet will be stronger if the core is made from _________. This is because _____________________________________________. Method Here is a diagram of the apparatus you will use - label the diagram using words from the apparatus list Apparatus: •Insulated wire •Connecting wires •Power pack •2 crocodile clips •Paper clips •Iron rod or nail •Glass rod •Pencil Test 1 - number of turns of wire I will change the number of turns of wire. To make this a fair test I must keep the _________ and the _________ the same. Record your results in the table below. How many times will you do each test to make it reliable? …………….. Results Number of turns Number of paper clips picked up Challenge: Draw a graph of you results Plot the number of turns along the x axes, and the number of paper clips on the y axes. Considering your results/conclusion When there were more turns of wire, the electromagnet picked up _________ (more/less) paper clips. An electromagnet is _________ (stronger/weaker) with a lot of turns of wire. Test 2 – current You can change the current by changing the voltage. A higher voltage will give you a higher current. SAFETY: You can only go up to 6V max. To make this a fair test I must keep the _________ and the _________the same. How many times will you do each test to make is more reliable?.......................... Results Voltage (V) Number of paper clips picked up Considering your results/conclusion The electromagnet is strongest when the voltage and current are _________ (highest/lowest) Challenge: draw a graph of results. Voltage on the x axes and number of paper clips on the y axes Number of paper clips Voltage (V)