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Resistivity Experiment.

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Introduction

Resistivity Experiment. Aim: To find out whether or not temperature affects the resistivity of a metal wire when put into oil. Plan. To find out whether or not that temperature does have an affect on the resistivity of a wire when placed into water I will take one piece of wire (iron) and put it into a circuit with a power supply, a voltmeter and an ammeter. The voltage given by the power supply will be kept at a constant voltage of 4 volts. The voltmeter and the ammeter are there as to measure any change whilst the experiment is conducted and the temperature is increased. The circuit will be made like in the diagram below, but the wire (shown as a resistor) will be coiled around a piece of wood and held with insulating tape. This is so that when the wire is placed into the water the wire doesn't touch itself and short circuit itself. This block of wood will be put into a beaker of water, which will be heated from below, as the beaker will be placed onto a tripod with gauze. ...read more.

Middle

The experiment was set up as the plan indicated the experiment went completely according to plan. The experiment was conducted over the two-hour period as I set for it in the plan, this way I could conduct the experiment over a long enough time period as not to rush it, so that the possibility for error could be avoided. Observing and recording. Length of the wire (L) = 50cm = 0.5m. Diameter of the wire = 0.28mm = 0.00028m. Results: Attempt 1. Temp. (?C). Voltage (volts). Current (amps) Resistance (ohms). 25 1.96 1.04 1.88 50 1.95 0.90 2.16 75 1.99 0.89 2.24 100 2.02 0.87 2.32 125 2.00 0.86 2.33 Attempt 2. Temp. (?C). Voltage (volts). Current (amps). Resistance (ohms). 25 1.86 0.96 1.95 50 1.82 0.96 1.89* 75 1.91 0.92 2.08 100 1.88 0.87 2.16 125 2.01 0.86 2.33 Attempt 3. Temp. (?C). Voltage (volts). Current (amps). Resistance (ohms). 25 1.99 0.94 1.90 50 1.92 0.96 1.89* 75 1.90 0.88 2.15* 100 1.87 0.87 2.14 125 2.00 0.89 2.24 * = Anomalous result caused by speed in which the results were taken. ...read more.

Conclusion

The error bars on the graphs allow for such errors to occur, the resistivity error bars allow for a + 0.1 x 10-7 ?m error margin, while the resistance graph allows for a + 0.05 ?. The experiment could have been set up as to limit the possibility for inaccurate results, by having the wire more spread out in a larger amount of water. This is because the beaker full of water is very small so the piece of wood and the wire fill the beaker easily this makes the chance of the wires touching and short circuiting the experiment. I would say that the results were good enough to bas a good conclusion on, as the results still clearly show what was predicted, this being that the resistance and the resistivity increase with temperature. The experiment could be made better by setting the experiment in such as way that it is impossible for the wires to touch in any way. Using more water and a larger piece of wood, or simply fixing the wires and the crocodile clips down so that they can't move and touch each other could achieve this. ...read more.

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