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# Planning Experimental Procedures

Extracts from this document...

Introduction

Planning Experimental Procedures Introduction In this experiment I will make a circuit using different materials of wires. To alter the length of the wire to be tested I will use crocodile clips. Voltage will be measured by using a voltmeter. Amps will be measured using an ammeter. Then the resistance is to be calculated. Key Factors Identified One variable should be carried out at a time, to make it a fair test. I am going to investigate what factors affect the resistance of a wire. Here are the main factors, which affect the resistance of a wire and some reasons as to why they affect the resistance of a wire: The material of the wire (What the wire is made out of) The length of the wire The thickness of the wire (The diameter of the wire) Temperature of wires Contact resistance The material of the wire The material of the wire is important because different metals have different properties. Metals, as wires are different because copper is very good at conducting electricity, if you had very large lengths of copper wire then you would be able to see the resistance change. Electrons find it easier to pass through some materials then others. I am going to use nichrome, copper, manganin and Constantan. The material of the wire when cut should be clearly labelled to prevent it from being mistaken as another material. The length of the wire The length will make a difference because when you have a long wire the electrons have to squeeze together to be able to pass through the wire than they do to be able to pass through a short wire. The longer the wire the longer the current has to travel so each electron is more likely to collide with the other electrons, slowing them down, causing heat to be produced. When cutting the wire, use a ruler and be as accurate as possible. ...read more.

Middle

Average Current (Amps) Potential Difference Average (Volts) Resistance (Ohms) ? 5 0.6 0.06 0.1 10 0.5 0.1 0.2 15 0.55 0.15 0.27 20 0.53 0.2 0.37 25 0.54 0.25 0.46 30 0.5 0.4 0.8 35 0.5 0.3 0.6 40 0.49 0.44 0.89 45 0.5 0.45 0.9 50 0.48 0.49 1.02 Here is a step by step plan of how I recorded my results, 1. I recorded the readings from the analogue ammeter 3 times. 2. I found the analogue average, by adding the 3 results and dividing by 3. 3. I recorded the readings from the digital ammeter 3 times. 4. I found the digital average, by adding the 3 results and dividing by 3. 5. I added the digital and analogue ammeter together and divided by 2 to find the amp average. 6. I recorded the volt meter readings 3 times 7. I found the average of volts. 8. I divided the amp average by the volt average to give me the resistance in Ohms. 9. I swapped my results with another group so that I could later compare the results in my write up. There aren't many anomalous results. I have circled the anomalous results. I followed this step plan for recording results for 24 SWG of Manganin, Constantan, and Nichrome. The secondary data only has the average numbers because I do not need to have every single recording of the other person's data, I have enough information because I have their averages. Precision I attempted to be as accurate as possible as I said in my previous precision. I was being accurate by... * When I measured the wires to test their resistance I used a ruler to be correct in measuring, then I asked a member of my group to double check the length of the wire to see if I was correct in measuring. * Once the wires had been cut to save confusion I labelled them with their SWG, length and material of wire. ...read more.

Conclusion

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