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An investigation into the factors that affect resistance.

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TITLE: An investigation into the factors that affect resistance.


 The aim of this investigation is to see, if different length of wire will affect the resistance. I also have to work out three length needed to create a resistance of 5 ohms, 10 ohms and 15 ohms.


In this investigation, I am going to work out how the length of a wire made up in a circuit, will effect the resistance.

    If the resistance is low, then it will show as that the efficiency is high. But if the resistance is high, then is will show that the circuit has less efficiency.  


The following information that I will write will be on my background knowledge for this investigation.


In a circuit the energy source like a battery, the amount of current that flows, which is allowed by the resistance of the circuit. All conductors resist the flow of electric charge to some degree. The bigger the resistance of the conductor, the harder it is for the electric charge to flow through it. If a given voltage were applied, then the current would be less.


Voltage means when, in a circuit, the voltage pushes the current away. And another name for voltage is potential difference. An instrument that is used to measure voltage is called a voltmeter. And they are measured in volts.  


Current means, the amount of charge that flows in a circuit per second. An electric current is a flow of charged particles as well. Current is measured in amperes, and the instrument that we use to measure current is called an ammeter.  


Electricity means the flow of electrons that flow in one direction. And this flow on electrons can only flow in one direction in a circuit.  


...read more.



2, 1-meter













                 Power pack


The variable that I will be changing is the length in which the current has to pass through the constantan wire. I will try to keep the measurement as accurate as possible, by using the meter rulers. I will also use the same piece of constantan wire, so that the thickness on the wire will be the same, so that my experiment will be a fair test if the wires thickness will be the same. I will also keep the voltage the same throughout the whole experiment, also to make it a fair test.

    The factors that will affect resistance are the following:

1- Temperature    

2- Material

3- Length

4- Width


Before I will even start my experiment, I will make sure that the area that I will be working in should be clean, and I will make sure that I will put my coat on the hanger to avoid me or any one else falling over it. And I will also make sure that I will put my bag under the table properly, so that it will also avoid me or any one else falling or tripping over and getting hurt. I will also make sure that I will be wearing gloves because I am working were there is electricity is involved. I will also be wearing gloves because the wire I am using may be sharp, so that if it is sharp then I want cut myself because I am wearing the gloves. Also for safety reasons I will make sure that I will not run in the lab, because I can hurt my self or even other people, and I may even ruined my experiment or someone else’s experiment.


...read more.


    On my graph I got a few anomalous results and I circled them on the grape. I may have got these anomalous results because I may have read the ammeter or the voltmeter wrong, or I may have type the wrong numbers on the calculator when I was working out the average resistance.

    I have found ways that I could have extended this investigation. I could have found out what affects resistance, I also could have investigated on how the width of the wire affects resistance, how different materials, affect resistance and how temperature could affect resistance.

    Overall I think that I have carried out a successful investigation. And I am also pleased that I was able to meet my aim, in order to carry out this investigation.


If the wire is longer, it will have more ions in it. For that reason, there will be more resistance because the wire is long, so there will be more chance of collision.

The thicker the wire the routes, in which the current can pass through. The current can pass more easily. For that reason if the wire is thicker, the resistance will be low. If the temperature would increase, then the ions will vibrate more. When the ions would vibrate more, then there will be more collision. When the collision will take place, it would create a higher resistance.    

...read more.

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