• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11

Investigate and measure the resistance in nichrome wire of different thickness, used in the circuit.

Extracts from this document...


Affects on Resistance Investigation.

Aim: To investigate and measure the resistance in nichrome wire of different thickness, used in the circuit.

Resistance is something that slows down the flow of electrons in the circuit.

“The greater the resistance the more voltage is needed to push a current through the wire”

Therefore the resistance of a wire is calculated by:


The four main factors, which affect resistance, are resistance are thickness, length, conductors and temperature.

A thin wire has more resistance than a thick wire. So as the thickness increases the resistance decreases.

As cross sectional area increases, the resistance decreases” (PFY)

So by doubling the wire, the resistance becomes weaker, as it has two paths for the electrons to flow through. My preliminary experiment shows that the thicker the wire the more current goes through it. This is because the electrons have a larger travelling path. In thin wires the electrons have smaller space to flow, therefore the resistance is higher.

A longer wire has more resistance than a shorter wire, so therefore as stated in PFY book “As the length of the wire increases, the resistance increases”

This means that as the length of the wire increases, it resists the flow in the circuit, therefore the resistance increases.

Conductors play an important role in resistance. Conductors, which are poor, have more resistance. A preliminary experiment of conductors and resistance showed us that a good conductor has less resistance than a poor conductor like nichrome.

...read more.



Fair test:

To make this experiment a fair test the power pack will be kept at the same voltage (6V), the length of the connecting wires will be kept the same and the ammeter and voltmeter will be kept in the same place. The positions of the reading on the rheostat will be kept the same (5cm apart) this is because the readings would be more accurate.

Accuracy: I will be repeating the whole experiment twice and will record the results in a results table. To get the readings accurate, I found out the averages between the 4 different rheostat positions for each layer. I then repeated the experiment, found out the averages of the positions again, and them found the final averages between the averages of the two experiments.

Safety: I will be careful and insuring that no water will be in contact with the apparatus (circuit)

...read more.


Investigations that I may carry out related to resistance, are the other factors, which effect resistance.

I would carry out an investigation of how the length of nichrome wire would affect resistance. I would do this by placing different sized nichrome wire into a similar circuit to this investigation and would record and analyse the results, and to see if there are any other patterns or trends that I could identify. I would also like to see whether or not the results of my experiment would obey the scientific theory of the effect of the size and resistance. The science theory of effect of size on resistance is “As the length of the wire increases, the resistance increases.” (PFY)

By Kajal Patel 10mh

Preliminary experiment.

Aim: To find out a material to use for the resistance investigation

Prediction: I think that the nichrome wire will be the best material to use for the investigation.

Apparatus: Power pack, ammeter, connecting wires, nichrome and copper wire.

Method: We connected the circuit with an ammeter. We replaced a gap with different types of wire, of the same length, and two thicknesses. We then read the readings of amps on the ammeter, and recoreded them in a table.



















From my results, I conclude that nichrome is a better resistor than copper, and therefore it would be ideal for me to use nichrome in the investigation. Copper allowed more current to pass through, and so was less resistant than the nichrome, as it resisted the flow of electrons.

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Electricity and Magnetism essays

  1. Marked by a teacher

    Resistance Aim: my main aim is to investigate the factors that affect the resistance ...

    3 star(s)

    can be calculated by the formula R= R1 R2/ R1 + R2 The modal of charge: All materials have some resistance to a flow of charge. A p.d. across the material causes free charges inside to accelerate. As the charges move through the material, they collide with the atoms of the material which get in their way.

  2. An experiment to find the resistivity of nichrome

    Metals conduct electricity at all temperatures, but for most metals the conductivity is best at low temperatures. Resistance in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current.

  1. Investigate the resistance of different wires and how at different lengths the voltage increases ...

    it shows a positive correlation between the length and resistance which means that as the length increases so does the resistance. The theory behind this is that in a wire as it increases it will have many more atoms in its way causing an increase in the resistance.

  2. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    had constants of proportionality, I could put both the formulae together into one, which related all three variables. If I repeated this experiment again, I would again change several things to improve the quality and the reliability of my results.

  1. Investigating The Effect Of Resistance On A Capacitor Circuit

    it was on it's holder at all times and only remove it when it had cooled down. Preliminary Work: Before conducting the proper GCSE physics coursework experiment, we carried out a practise experiment on the discharge of a capacitor with a very similar method with the exception of using a data logger.

  2. Investigation on the Resistance of Nichrome wire

    This means that throughout all of my experiment the voltage will be the same so that it will be fair. 2) The voltage in the circuit will stay the same and so will the current. This is because the battery, which is 9V, is controlled by the multimeter.

  1. Physical - Circuit

    A resistor can be use as protecting the ammeter; therefore we set the resistor at a fix spot and switch on the switch again. This time, our result seems to be as what we expect to be. This experiment we're using the constantan wire with the thinnest diameter, 0.45mm; we

  2. How Is Resistance Affected In a Circuit

    * Make sure I move the crocodile clip 10cm until I get to 100cm. I must make sure I move it exactly 10cm each time to give the most accurate set of results as possible. * Change only one variable i.e.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work