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Factors Affecting The Resistance Of A Wire

1216 words - 5 pages

Factors affecting the resistance of a wireIntroduction:Resistance is a force, which opposes the flow of an electric current around a circuit.Resistance is measured in Ohms. George Ohm discovered that a circuit sometimes resists the flow of electricity. He called this 'RESISTANCE.' He even came up with a rule for working out the resistance of a circuit, which was:R= V ÷ IV- VoltsI- CurrentR- ResistanceOhms law says the more resistance means more energy is needed for the current to pass through the wire. Resistance is a measure of how much energy is needed to push the current through something.Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance.THE FOUR FACTORS THAT AFFECT THE RESISTNCE OF A WIRE ARE:1. LENGTH OF WIRE2. THICKNESS OF WIRE3. TEMPERATURE4. TYPE OF METALAIM:To investigate how the length of a Nichrome wire can affect the resistance of a wirePREDICTION:In my opinion the longer the wire the more resistance there will be. I believe this because if the length of the wire is increased then the resistance will also increase, as the electrons will have a longer distance to travel and so more collision and friction will occur.VARIABLE FACTORS:The factors that I am going to vary are the length of the Nichrome wire and adjust the variable resistor to take 3 readings.The factors that I am going to keep constant are: same thickness of the wire and the set up of the circuit should be the same.APPARATUS:v NICHROME WIREv POWER PACKv METER RULERv CROCODILE CLIPSv SELLOTAPEv CONNECTION LEADSv AMMETERv VOLTMETERv VARIABLE RESISTORDIAGRAM:A VMETHOD:I started of with the experiment by setting up the circuit as shown above. I had to be careful in connecting the circuit, because the voltmeter had to be placed in parallel and the ammeter, which had to be placed in series. The Nichrome wire was cut to just over 100cm so the crocodile clips could attach onto the wire, making the results more accurate. I stretched out the wire and sellotaped it to the ruler. I did this so I do not need to cut the wire every time; all I have to do is just move one of the crocodile clips to another length. The power supply is then switched on and put on 8 volts. I will then record the reading of the ammeter and put the results in a table. After this I will adjust the variable resistor to 7 volts, which would show up on the voltmeter, I will record the reading of the ammeter. I will once again adjust the variable resistor to 6 volts this time and record the reading.I will repeat this for the other four lengths, which are as follows:80cm60cm40cm20cmSAFETY:The safety precautions that I need to be taken into consideration are: Handle the power supply carefully. Be careful when touching the wire, it may be hot, it might even burn if the voltage exceeds above 8 volts. Do not carry out the experiment in wet areas, as waster is a very good conductor of electricity,...

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