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Resistance is a measure of how hard it is to get a current through a component at a particular potential difference or voltage.

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Introduction

Year 10 Coursework-Resistance Assessment Resistance is a measure of how hard it is to get a current through a component at a particular potential difference or voltage. Potential difference , current and resistance are related using this formula: Potential Difference(volt, V) = Current (ampere, A) x Resistance (ohms) Prediction: I predict that the shorter the resistance wire, the less resistance there will be, I also think that this will mean the lower the resistance the higher the current will be. Hypothesis: I think what I have put in my prediction is true because the greater the resistance of a substance the less current it will allow to flow through the given voltage. We can use an equation to work out the amount of current able to flow through a circuit at any one time Current = Voltage Resistance I think the less resistance wire used, the easier and quicker the current will be able to flow through the circuit. This is because their will be less of a resistance stopping the electrical current getting through. ...read more.

Middle

I could set the amp meter or voltmeter to the wrong setting which could make my results inaccurate. I think that the less resistance wire used, the easier and quicker the current will be able to flow through the circuit. To make my planning easier I have done work even before I wrote this assessment, I have found out that resistance is a measure of how hard it is to get a current through a component at a particular potential difference or voltage, I learnt this from the AQA Double Award Modular Science- The Tested Modules (Higher Tier Book). Also I found out that Potential Difference(volt, V) = Current (ampere, A) x Resistance (ohms) Is the way to work out how current and resistance are related. Fair Test: To make sure the test is fair I will keep the voltage on the power pack the same throughout the experiment. Also I will make sure the readings on the voltmeter and amp meter are always recorded how each metre says and not change them to make the results more accurate. ...read more.

Conclusion

I measured the resistance wire to the 200 cm and used a crocodile clip to connect it to the meter ruler. I then turned the power pack on and recorded the readings on the amp meter and voltmeter as shown in my tables of results. I repeated the experiment for the other resistance wire measurements. I did each measurement twice to make my results more accurate. To work out the average for each length of resistance wire I took both sets of results and first looked at the 200cm results I used both them and did this formula to work out the resistance: R= V divided by C I then repeated the formula to work out the other results. I then recorded the averages on my table. Tables Of Results Length (cm) 200 190 180 170 160 150 Voltage (V) 3.56 3.56 3.53 3.48 3.44 3.39 Current (amps) 0.39 0.43 0.47 0.50 0.54 0.59 Resistance (ohms) 9.12 8.27 8.27 6.96 6.37 5.74 Length (cm) 200 190 180 170 160 150 Voltage (V) 3.54 3.57 3.55 3.47 3.44 3.30 Current (amps) 0.39 0.95 0.46 0.49 0.54 0.50 Resistance (ohms) 9.07 8.30 7.11 7.08 6.57 6.37 Averages 9.095 8.285 7.51 7.12 6.37 6.055 Diagram Of Apparatus Jamie Noke 10 ANS Yr10 coursework Physics Mr Tebay 10S ...read more.

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