• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Physics coursework - resistance of nichrome wire

Extracts from this document...

Introduction

PHYSICS Name : Shannon Weir Date : Candidate Number: Centre Number: 71705 SKILL AREA P : PLANNING EXPERIMENTAL PROCEDURES THE PROBLEM; we need to find out if the resistance of nichrome wire is affected by the length of the wire. BACKROUND KNOWLEDGE; Electricity is a form of energy. Electricity is the flow of electrons. All matter is made up of atoms, and an atom has a center, called a nucleus. The nucleus contains positively charged particles called protons and uncharged particles called neutrons. In a conductor the property that lets the electricity flow is the free electrons. Resistance is a force caused by free electrons it is measured in ohms, resistance increases if heat is increased. Long wires are more resistant than short wires because there are more electrons in a longer wire. ...read more.

Middle

VARIABLES INDEPENDENT VARIABLES; alter length of wire CONTROLLED VARIABLES; thickness of wire and temperature DEPENDANT VARIABLE; voltage and current meausured. Voltmeter required to measure voltage, ammeter to measure current (amps). Both are needed to find resistance. Voltage = current x resistance APPARATUS; 100cm of nichrome wire, red and black leads, power pack, variable resistor, ammeter, crocodile clips, voltmeter. USING RESULTS; A table of results will be present like this. LENGTH OF WIRE CURRENT VOLTAGE RESISTANCE 1ST 20 40 60 80 100 2ND 20 40 60 80 100 3RD 20 40 60 80 100 Then I will record the averages on a line graph, and put in a line of best fit like so METHOD 1. set up apparatus 2. set the power pack to 2 3. ...read more.

Conclusion

EVALUATING The method used seems to be the best way of performing the investigation, although if it was to be repeated the following improvements would be made: � Carry out the experiment for more lengths, such as 10cm, 30cm etc. This would help to obtain a more reliable set of results. The evidence obtained was reliable, however like I previously said I could have obtained a more reliable set of results by carrying out the experiment for more lengths of wire to reinforce my point that the longer the length of wire the greater the resistance is. Taking all this into account, the results and evidence obtained is sufficient enough to support the conclusion that the longer the length of wire, the more atoms and impurities in the wire are present therefore meaning the resistance is greater. ...read more.

The above preview is unformatted text

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. GCSE Physics Coursework - Resistance of a Wire Coursework

    1.85 50 1.08 0.48 2.25 60 1.15 0.42 2.74 70 1.19 0.37 3.22 80 1.22 0.33 3.70 90 1.26 0.30 4.20 100 1.27 0.28 4.54 Having completed two sets of results for one wire, it was noticed that these was a large black mark towards one end of the wire,

  2. GCSE Physics Coursework - Resistance of a Wire Coursework

    Resistance (W) (to 2 d.p.) Wire 1 Wire 2 10 0.52 0.89 20 0.96 1.77 30 1.40 2.70 40 1.86 3.55 50 2.29 4.31 60 2.76 5.26 70 3.26 6.17 80 3.67 6.98 90 4.36 8.22 100 4.57 9.04 Conclusions Having performed the investigation, the following conclusions were drawn: *

  1. An experiment to find the resistivity of nichrome

    This is because of the increase in the space for the electrons to travel through. Due to this increased space between the atoms there should be less collisions. To chose which factor I am going to investigate I am going to consider how I would measure each factor and which factor would be the best and easiest to record.

  2. Physics Coursework Gravity Investigation

    However, after releasing the ball I positioned myself so that my eye level was parallel to the height of the sticky tape and saw if the ball bounced higher, lower or the same. The height was recorded and the sticky tape adjusted if the reading had changed.

  1. Resistance Coursework

    Some metals have less resistance than others. Wires are always made out of copper because copper has a low resistance and therefore it is a good conductor. The length and width of a wire also has an effect. A variable resistor alters the amount of current flowing easily, which makes it very useful for speed control or light dimming.

  2. --- PHYSICS INVESTIGATION ---

    My preliminary results have shown that 'as the length of a wire increases the resistance also increases. I have used the ammeter ranging from 0 - 1A as it is more accurate (reads in interval of 0.05A) but have lowered the voltage on the power pack/supply so all results range between 0 - 1A.

  1. A.S. Physics Practical Coursework Resistance of Nichrome Wire

    I will make sure that I do not conduct the experiment near the sinks in the laboratory. This is because I could electrocute myself if any water were to spill onto any part of the experiment. When I am connecting the crocodile clips onto the wire I will ensure that the power supply is turned off from the mains.

  2. Planning Experimental Procedures

    I assume the crocodile clips are made out of steel. Steel has a low resistivity rate. Fair Test Described To make my experiment as fair as possible I will change one variable at a time. For example I can not have one experiment using 5 cm of manganin 24 SWG

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