An introduction to the dependant variable and the resistance of the wire

Resistance Material The material and diameter of the wire needs to be kept constant to keep the test fair as we are investigating resistance. The independent variable will be the length of wire as we will be changing it to see whether or not the resistance changes. The dependent variable will be the resistance of the wire as that is what is going to change due to the length of wire.

An introduction to the dependant variable and the resistance of the wire

I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit. I will then turn the power pack on and record what voltmeter and ammeter readings.

I will switch off the power pack, move the crocodile clip that was at 5cm up to 10cm, and switch on the power pack. Again, I will record the voltmeter and ammeter readings and turn off the power pack. I will repeat this method every 5cm until I get up to cm, taking three readings from both the voltmeter and ammeter each time to ensure accuracy.

Apparatus Ensuring Accuracy To ensure accuracy I will record the voltage and the current three times every 5cm and take the average reading.

This will reduce the chance of false readings and will cancel out any anomalous results. I will also ensure that the wire does not heat up too much by confirming that I do not set the voltage too high on the power pack and by maintaining the same the voltage for every reading.

In addition, I will make sure I turn the power pack off after each reading. I will try to make this investigation as accurate as possible. Variables There are different variables that can be changed in this experiment; these are the independent variable.

However, due to my line of enquiry, I will only change the length of the wire. The variables I will control will be the type of wire resistivity and the cross-sectional area of the wire.

I will also control, using the power pack, how many volts pass through the wire. Below is a table illustrating the effect of changing the variables see Table 2: Variables Safety I will ensure experimental safety by confirming that all the wires are connected properly and that none of the insulation on the wires is worn.

I will also ensure that there is a clear indication that the power is isolated by means of a switch and an L. I will stand up during the investigation to ensure that I do not injure myself if something breaks.

Results Below is a table of my results Table 3.

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I have taken three reading and have worked out the average, shown in red. This confirms the first part of my prediction: In addition, my prediction that doubling the length of the wire increases the resistance by a factor of two is correct see Table 4.

Graph Graphing these results shows a nearly straight line, illustrating a strong positive correlation between length and resistance, which is consistent with my prediction.

Discussion Overall, my results are very consistent with my predictions. Most of the data points were on, or very close to, the line of best fit. There are a few data points that are farther away from the line of best fit than the others, but they are still consistent with the general trend.

There are no anomalous results that I would consider to be far away from the line of best fit. There are possible sources of error that might have led to inconsistent results, such as a kink in the wire.

This would have prevented the area of the wire from remaining constant and would have affected my results. However, I made sure that the wire remained straight throughout the experiment.

I think that the range of my results was sufficient enough for me to draw a valid conclusion about how the length of the wire affected the resistance.

This was because I could plot a graph and show the general trend. However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot. Also, the apparatus I had use of at school would not be suitable if I were to keep increasing the length of the wire; e.

I think my method could have been improved to produce results that were even more consistent.Independent variable; Dependent variable; Constant(s) Resistivity of a Wire. Name: _____ I.

INTRODUCTION. The resistance of an electrical conductor depends on several factors.

An introduction to the dependant variable and the resistance of the wire

Its physical shape is one factor. The type of conductor material is another, as might be expected. That is, two conductors with the same physical shape, but of. Independent variable; Dependent variable; Constant(s) Resistivity of a Wire. Name: _____ I. INTRODUCTION. The resistance of an electrical conductor depends on several factors.

Its physical shape is one factor. The type of conductor material is another, as might be expected. That is, two conductors with the same physical shape, but of. Varistor is a voltage dependent feelthefish.com resistance of a varistor is varied depends on the voltage applied.

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Varistor is a voltage dependent feelthefish.com resistance of a varistor is varied depends on the voltage applied. Here know about varistor circuit with working.

Varistor is a voltage dependent feelthefish.com resistance of a varistor is varied depends on the voltage applied. thin film resistors, metal film resistors), & variable resistors (wire. Variable resistors can be used to adjust circuit elements (such as a volume control or a lamp dimmer), or as sensing devices for heat, light, humidity, force, or chemical activity.

and temperature coefficient are mainly dependent on the technology used in manufacturing the resistor. An alternate construction is resistance.

Measuring resistance with a voltmeter and an ammeter