Would you like to answer one of these instead? It acts as an electric pump. The more lanes you have, the faster the cars go through, where the number of lanes obviously represent the wire thickness and the cars represent electrons. I will also wear safety goggles incase of any sparks or anything else that could damage my eyes. A Galvanometer is used to measure the current of the circuit and the Wheatstone Bridge is used to measure the resistances and determine the unknown resistance. Length Of Wire: This will affect the resistance, as if the piece of wire is very long it will take the current a long time to pass all the way through of it, whereas if you have the piece of wire too short, then there will be no resistance and it will not work.
When electricity flows through a wire, its electrons must move past the individual atoms of the wire material. Model Of Resistance: Resistance measures a materials opposition to the flow of electric current. The electricity naturally flows through wider wires at a much higher rate compared to a narrow wire. There is a higher current in the thicker wire although per unit area, of course, each wire carries the same current. If the wire is round, the cross- section is a flat circle and the area is π r 2.
This again increases the force needed to get passed the free moving electrons, raising the voltage. Now if you increase the length of this wire to 20 cm its resistance R will be twice than it was at 10 cm. We learnt that generally as the length doubled, so too did the resistance of the nichrome wire, proving our prediction was correct and accurate. Introduction: This first report in Physics will show the investigation of how the length of a wire affects its resistance. Insulators have a high resistance How do electrons behave with and without voltage? The electrons don't physically collide like charges repel , but they do interact through the static forces. There are no anomalous results that I would consider to be far away from the line of best fit.
Resistance would be increased when cross-sectional area of wires decreased. Results Below is a table of my results Table 3. Perhaps we should have let the wire to have longer to cool down, so that the particles within it were not too hot. A cell pushes these electrons around a circuit. Resistance is where the electrons flow towards the positive ions and crash into other atoms that lie in their path. However, it would make my results very accurate.
Therefore; the more lines the less possibility the cars will ever collide even with a zig zag path. In addition, my prediction that doubling the length of the wire increases the resistance by a factor of two is correct see Table 4. For starters I will go through the main definitions, to get a better knowledge of what is going to happen. When I measured the lengths of the nichrome wire, my measurements may have been slightly inaccurate as it was difficult to measure the exact length I wanted by eye. Resistance is the opposition to the flow of electric current through a material. Increasing the number of electrons experiencing the slope will mean more flow past a point in a second and so more charge passes a point in a second and more current flows.
I could have considered using a new piece of wire each time in order to regulate the temperature more stringently. Cut each 8 inches long. This is because there is a steeper 'electric slope' in place to make the charges slide down. The things that I will keep the same are the temperature of the wire, by switching off the power pack after collecting each set of results, the voltage setting of the power pack, 2 volts, and the equipment, including the wire, that I will use. This was the length of the nichrome wire.
To help me plan my investigation I have completed a preliminary experiment in which I investigated the effect of the thickness of a wire on its resistance, using three constantan wires and one copper wire. There are factors which can affect how accurate our expriment is come on four levels. I could also continue my range of lengths up to 100cm at 5cm intervals. As the electrons give off more energy, the atoms vibrate more, making it harder to allow the electrons to get through the wire. My repeated readings were also all very similar and close to each other.
There are 4 main factors. 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. This could have meant the resistance was higher in the hotter room, as the atoms had more energy so were able to move quicker. The predicted graph showed that at 50cm, the resistance of the nichrome wire should have been 10 ohms. The thicker the wire the less resistance it will have and will allow more electricity to pass without c … reating friction, the friction is what causes the wire to heat up and glow. I found that the apparatus I used was suitable, but I think that I could possibly increase the number of data points to generate more reliable results, perhaps by increasing the length of the wire by 5cm each time, instead of by 10cm.