In fact, a Amp circuit is protected by a fuse or circuit breaker that will flip off when the current reaches 20 Amps. Switch the circuit on again. Discuss how this can be taken account of. The standard metric unit for resistance is the ohm, represented by the Greek letter omega.
One approach is as discussed above to keep the wire at a constant temperature by immersing it in a water bath. Resistors are one of the more common components in electrical circuits.
If a gauge wire was used on the same circuit, then the breaker would allow up to 20 Amps to flow through it. This is not a straight line showing constant resistance, but rather a curve showing that the resistance of the wire increases with temperature.
There are no anomalous results that I would consider to be far away from the line of best fit. A Amp circuit should never be wired using gauge wire. The ruler has a large gradient. Investigating the effect of length on resistance is common but some students may wish to investigate the effect of the thickness of wire.
Determine the resistance of a 1-mile length of gauge copper wire. In this case, the temperature of the wire is a factor which affects measurements of its resistance. 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.
If you use a mains power supply, use one that is designed to limit the output current to about 1 amp, and preferably with a current overload indicator. Procedure a Connect up a series circuit of two cells, and the ammeter, with a 30 cm length of one of the wires closing a gap between two crocodile clips.
During this time the coil heats up and the current changes quite rapidly. Move down the graph, from point to point, showing that the gradient decreases. Explain that the resistance of the wire is equal to p.
However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot. I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit. Mathematical Nature of Resistance Resistance is a numerical quantity that can be measured and expressed mathematically.
It could overheat and thus lead to the risk of fire.Like the resistance to water flow, the total amount of resistance to charge flow within a wire of an electric circuit is affected by some clearly identifiable variables.
First, the total length of the wires will affect the amount of resistance. Sep 29, · How to set up a circuit with an ammetre and voltmetre to measure the resistance of a wire.
Mentions different thicknesses. search essay examples. browse by category. browse by type. Get Expert. An Experiment to Determine Resistance in Relation to a Wire's Length.
words. 2 pages. An Introduction to the Dependant Variable and the Resistance of the Wire. 1, words. 3 pages. An Experiment to Measure Wire Resistance in Relation to Changing.
The Resistance R is the resistance wire (constantan nichrorome) that you will be trying to calculate. Set the power supply to 1V. This limits the current through the wire in order to reduce any heating effect which may change the resistivity.
In order to test how the resistance of a particular material is related to its length and cross sectional area, an experiment in two parts must be conducted.
The first part has the length as the independent variable with all other variables controlled; the second has the cross sectional area as the independent variable with all other variables.
- Resistance of a Wire Planning I am performing an experiment to find the piece of wire with the highest/ lowest conductivity, and the highest/ lowest resistance out of two samples.
The two pieces of wire are Nickel Chrome and Constantin.Download