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# Resistance Investigation

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Introduction

Resistance Investigation I am going to investigate the factors that affect the resistance of a conducting wire. Background Knowledge about Resistance Relative Knowledge about resistance is: 1. Resistance = Voltage Current 2. Resistance is measured in Ohms (?) 3. Voltage is measured by a Voltmeter in Volts 4. Potential Difference is the technical word for Voltage 5. Current is measured by an Ammeter in amps 6. High current = low resistance 7. Resistance is caused by the electrons in each atom colliding Plan The Key factor that I plan to investigate is the length of wire, and I will vary the lengths of the wire, and calculate the effect of this factor in a six volt circuit by recording the voltage (volts) in parallel with the wire, and current (Amps) in series with the wire. I will record my results several times to ensure accuracy and then I will draw up my results into a table. ...read more.

Middle

I used three different wires: Manganin, Nichrome and Constantan. I have noted down the Voltage, current and resistance and have checked my results an extra time to find an average. Before I started taking the results I decided to take a preliminary result. This was: * Variable resistor was low = 1.4 Volts = 0.25 Amps * Variable resistor was high = 4.8 Volts = 1.25 Amps * Variable resistor in the middle = 2.4 Volts = 3.5 Amps This tells me that keeping the variable resistor in the middle will be best because the voltage is not to low or not too high. Also, the wire will get to hot if the variable resistor is high and may affect my results. When the resistance is to low, there won't be a big enough distance. Results Length V1 I1 R1 (?) V2 I2 R2 (?) Average Resistance (?) (cm) ...read more.

Conclusion

There is not a great difference between my first and second set of results, showing that they are reasonably accurate and reliable. The 'line of best fit' fit well with my results which were fairly consistent, showing that the tests were carried out fairly accurately. I chose this method of setting up my circuit because it is standard and also it is the simplest and easiest to set up. I set up my circuit so it would be easier when changing the wire. In this way, I can use the same circuit for each wire. This also ensures accuracy. To extend this investigation, I would investigate my other prediction: The bigger the area of the wire (thickness), the lower the resistance. In doing this, I could keep the same circuit as I already have but change the area (thickness) of the three wires. I would use the same length for each wire and I would record the results from three different thicknesses for each of the three wires. These would be at 24, 26, 28 and 30. ?? ?? ?? ?? ...read more.

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