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. An hour will be spent prior to the conducting of the experiment as to see whether the experiment set up is feasible and checking that everything in the set up of the experiment works. The next hour will be spent conducting the experiment and collecting the results. The resistivity and the resistance of the wire will be recorded at five temperatures starting at 25?C and going up at 25?C at a time, so going up to 125?C. The voltage of the wire and the current will be measured from the ammeter and the voltmeter so that the resistance can be worked out, and then in turn the resistivity of the wire. This procedure will be repeated three times, and then the averages of the three procedures will be taken and recorded. The diameter of the wire will have to measured to be able to work out the resistivity, and so if it happens to change for some unknown reason it can be taken into account so as the experiment can be kept an accurate one.
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. An hour will be spent prior to the conducting of the experiment as to see whether the experiment set up is feasible and checking that everything in the set up of the experiment works. The next hour will be spent conducting the experiment and collecting the results. The resistivity and the resistance of the wire will be recorded at five temperatures starting at 25?C and going up at 25?C at a time, so going up to 125?C. The voltage of the wire and the current will be measured from the ammeter and the voltmeter so that the resistance can be worked out, and then in turn the resistivity of the wire. This procedure will be repeated three times, and then the averages of the three procedures will be taken and recorded. The diameter of the wire will have to measured to be able to work out the resistivity, and so if it happens to change for some unknown reason it can be taken into account so as the experiment can be kept an accurate one.
