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

GCSE Physics Coursework - Current in a Wire

Extracts from this document...


GCSE Physics Coursework - Current in a Wire Coursework Variables to be measured: * Length of Wire * will be varied * Material of wire (experiment will be repeated for wires of different materials to see if the same effects are present when the length is varied) * Current through piece of wire. * Voltage across piece of wire. Variables to be kept constant: * Starting Temperature of the wire * Width of Wire (Cross-sectional area of wire) - for each experiment, the width of wire will not be varied. * Voltage supply from power pack (6 volts). Theory Current is directly proportional to voltage. ...read more.


Proposed Method As previously discussed, the length of wire was the easiest to control and measure, so this is what I shall vary. The following circuit was made to carry out the investigation: 1. One metre length of a wire is fixed to a metre rule. 2. The first crocodile clip is clipped to the wire at the 0cm position on the metre rule. 3. The second crocodile clip is clipped to the specific position depending on the required length of wire. 4. The power supply is turned on, with a constant voltage of 6 volts. 5. After waiting for 20 seconds for the temperature to become constant, the voltage and current are then read off the ammeter and voltmeter, and recorded. ...read more.


This is because the longer the wire, the more times the free electrons will collide with other free electrons, the particles making up the metal, and any impurities in the metal. Therefore, more energy is going to be lost as heat in these collisions, thus raising the temperature and by Ohm's Law the resistance will increase, thus the opposition to current increases and the current decreases. * Doubling the length of the wire will result in double the resistance, meaning half the current. This is because by doubling the length of the wire one is also doubling the collisions that will occur, thus doubling the amount of energy lost in these collisions. Proportionality: Current is inversely proportional to the Length of Wire. Resistance is directly proportional to the Length of Wire ?? ?? ?? ?? ...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

    Possible explanations for these anomalies are as follows: The length of wire for that particular measurement was not correct. At 50 and 80cm it is possible that the length was shorter, causing a lower resistance, and at 90cm it is possible that it was longer, causing a higher resistance.

  2. Physics Coursework

    So it was then decided that a potential divider circuit would be most suitable. The final decision to be made on the fixed resistor will be described later on in the piece. Preparation: Through previous experience, research and general advice temperature is typically a difficult thing to experiment with, as

  1. Resistance Coursework

    o I noticed that the voltage changed each time we changed the lengths, so to make it fair I will use a variable resistor in my investigation. This will allow me to adjust the voltage to 1. o I will also use sellotape to make sure the wire stay straight along the wire so that the length is correct.

  2. Physics Coursework Gravity Investigation

    If the bench were used as the surface to bounce the ball on, there would be no place for the upper stand to rest on making it very hard to position the upper rule accurately, resulting in unreliable readings. I chose a range of values, from 40cm to 200cm in

  1. Resistance Coursework

    and megohms, MW, (millions of ohms). Electronic components designed to have particular resistance values are called resistors. Hypothesis: Resistance is caused by electron bumping into irons. If the length of the wire is doubled, the electrons bump into twice as many irons so there will be twice as much as resistance (resistance as a length.).


    Connect insulated circuit wires and crocodile clips to the power pack/supply. 5. Connect or attach circuit wires to the voltmeter and Ammeter. 6. Place one crocodile clip on the 0cms and place the other at the point of measurement on the constantan wire. In this case every 10cm intervals.

  1. Resistance of a wire - PHYSICS COURSEWORK GCSE

    7 Crocodile clips Circuit diagram: Method First I will do some preliminary experiments (see further on in this dissertation) these will better inform me of how to best set up my investigation, what the range of results will be and to what degree of accuracy I will need to record my results to.

  2. Finding a material's specific heat capacity

    Taking averages helps to even out any small errors such as these in each of the experiments. Despite a seemingly large number of limitations to the reliability of the conclusion, ample consideration was made for many of the errors.

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