• 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...

Introduction

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.

Middle

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.

Conclusion

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. Marked by a teacher

    Resistivity Coursework

    4 star(s)

    0.400 0.30 0.80 2.67 0.400 0.60 1.60 2.67 1.09 x 10-6 0.500 0.30 1.00 3.33 0.500 0.60 2.00 3.33 1.09 x 10-6 0.600 0.30 1.20 4.00 0.600 0.60 2.40 4.00 1.09 x 10-6 0.700 0.30 1.40 4.67 0.700 0.60 2.80 4.67 1.09 x 10-6 0.800 0.30 1.60 5.33 0.800 0.60

  2. 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.

  1. Resistance of a wire - PHYSICS COURSEWORK GCSE

    Also, to have the most accurate results it would be best to go up in steps of 50mm, from 50mm to 600mm, as it seems that this area will suffice in providing me with sufficient values.

  2. 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.).

  1. Free essay

    Physics Coursework

    * Measuring * Ruler * Voltmeter This is a diagram showing how the equipment will be set up: Obtaining Evidence Method I will carry out the experiment by following the steps below making sure I keep it a fair test and record my results accurately as possible.

  2. Physics Coursework

    Typically under 100´┐ŻA avoids self-heating and does not drain the battery. After researching the best circuit set up for this sensor I was left with two options. The first, a potential divider, (Fig2) would give voltages readings with a voltmeter set up in parallel.

  1. Resistance Coursework

    taking the readings quickly so that we only allow the current to flow for a small amount of time, so that the wire does not heat up too much. Then after that I will have to leave the wire for a while, while it cools downs.

  2. --- PHYSICS INVESTIGATION ---

    Using the meter ruler measure out 1m of Constantan wire (28swg). 3. Cello tape the wire across the 1m ruler. Taught the wire so it is a straight a possible but do not over do it as it possibly could make the wire become thinner.

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