Results Below is a table of my results Table 3. Resistance is inversely proportional to cross-sectional-area.
Resistance is proportional to length. The more tightly an atom holds on to its outermost electrons the harder it will be to make a current flow. This does not give rise to a straight line graph as cross sectional area is inversely proportional to resistance not directly proportional to it.
If the outermost shell or sub-shell with transition metals is less than half full then the atom is willing to let those electrons wander and the material is a conductor. 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.
When a material gets hotter the atoms in the lattice vibrate more. Below is a table illustrating the effect of changing the variables see Table 2: Teaching notes 1 Use fine gauge wires.
Note the reading on the ammeter. There are possible sources of error that might have led to inconsistent results, such as a kink in the wire. The bigger the p. What would you have to plot? Discussion Overall, my results are very consistent with my predictions.
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. However, using new pieces of wire each time would have been too impractical and time-consuming in the context of this lesson. I will switch off the power pack, move the crocodile clip that was at 5cm up to 10cm, and switch on the power pack.
This will reduce the chance of false readings and will cancel out any anomalous results. A graph for this would be a bar chart not a line graph. For this reason, it is important to keep the current very low - copper wire is effectively a short.
In either case, different wires should be made of the same material. This confirms the first part of my prediction: A smaller potential gradient less volts per metre means current decreases with increased length and resistance increases. I will also control, using the power pack, how many volts pass through the wire.
Most of the data points were on, or very close to, the line of best fit. Students should be encouraged to adjust the voltage to keep currents small with every set of readings. There are four factors that affect the resistance of a wire: Resistance increases with the temperature of the wire.
Apparatus Ensuring Accuracy To ensure accuracy I will record the voltage and the current three times every 5cm and take the average reading.
However, this would then lose its value as an open investigation. However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot.
I will stand up during the investigation to ensure that I do not injure myself if something breaks. Students will find it easier to measure at a prescribed length if they tape the wire to a metre rule with insulating tape and make connections with flying leads rather than crocodile clips.Factors Affecting Electrical Resistance.
we tend to neglect any resistance in wires when we examine the behavior of ordinary loads (bulbs, resistors, motors, etc.) in electrical circuits. But metals are not perfect conductors, otherwise the wires in our toasters would not get hot.
In this experiment, you will examine the factors that affect. Investigate one or more factors affecting the resistance of metal wires area since I had decided that I would take ammeter readings at 10cm intervals of a length of 1m wire.
I would investigate the effect of cross-sectional area by comparing the different thicknesses of the wires at particular lengths.
Class practical A simple investigation of the factors affecting the resistance of a wire. News. Practical Physics» Electric circuits and fields» Resistance effects» Investigating the resistance of wires.
Search. Home; Topics > Astronomy > Atoms and nuclei > Electric circuits and fields This experiment was safety-checked in August. Factors affecting the resistance of a wire.
Introduction: Resistance is a force, which opposes the flow of an electric current around a circuit. An experiment to investigate the factors which affect the resistance in a wire.
Voltage is the electrical force, or "pressure", that causes current to flow in a circuit. 3/5(1). Factors that affect the resistance of a wire The resistance of an object is a measure of the how reluctant current is to flow through that object.
It is given the symbol R and has the unit W (which is a greek letter omega and pronounced 'ohm'). The aim of this experiment is to investigate one factor that affect Different wires composed of different metals will have differing - Investigating Factors Affecting Resistance of a Wire Aim Investigate what factors affect the resistance of wire, however in this experiment I am going to monitor how the length of a wire affects the.Download