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

The Factors Affecting the Resistance of a Wire

Extracts from this document...


THE FACTORS AFFECTING THE RESISTANCE OF A WIRE By Ali Allana 4J2 (4A2) Mr. Kerr THEORY What is resistance? As free electrons move through a metal due to an applied potential difference they collide with each other and with the atoms of the metal crystal lattice. The property of the material that restricts this movement is known as the resistance of the conductor. Ohm's Law and resistance Connect a single cell with a 6V lamp and a suitable ammeter. Note Ammeter readings as you increase the p.d using extra cells. Increase the p.d across the ends of a conductor and a greater current flows. ...read more.


5. Pressure 2. Temperature 6. Dimension (coiled) 3. Length 7. Magnetic Field 4. Thickness Key Variables that affect the resistance of a wire 1. Temperature 2. Material 3. Wire length 4. Wire width Prediction Temperature If the wire is heated up the atoms in the wire will start to vibrate because of increase in energy. This causes more collisions between the electrons and the atoms as the atoms are moving into the path of the electrons. Increase in collisions means that there will be an increase in resistance. Material: The type of material will affect the amount of free electrons that are able to flow the wire. ...read more.


Wire length: If the length of the wire is increased then the resistance will also increase as the electrons will have a longer distance to travel and so more collisions will occur. Due to this the length increase should be proportional to the resistance increase. Wire width: If the wires width is increased the resistance will decrease. This is because of the increase in the space for the electrons to travel through. Due to this increased space between the electrons there will be less collisions and the resistance will decrease. Preliminary work We will do extensive research on which width of wire is available in different materials in order to find the materials that will give us the best possible results. 1 ...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

    The factors affecting the resistance of a metalic conductor.

    4 star(s)

    These resistors are said to be in series, and as indicated, it is possible to consider them as one single equivalent resistor R. To find this equivalent resistor, we exploit the fact of length being proportional to the resistance of the wire, which by using ohm's law becomes: V =

  2. Investigate one or more factors affecting the resistance of metal wires

    Consequently, I have decided that I will use the metal alloy Constantan (otherwise called contra or eureka) in my investigation because it shows very small resistance change with temperature under normal laboratory conditions (Constantan only increases resistance by about one-hundredth-thousandth part per Kelvin rise in temperature).

  1. Investigation into the factors affecting the resistance of wire

    0.1 0.1 0.51 0.52 0.52 0.193564605 0.2 0.031415927 2.027E-05 Copper 36swg 350 0.1 0.09 0.09 0.46 0.48 0.46 0.200181159 0.2 0.031415927 1.79682E-05 Copper 36swg 400 0.1 0.1 0.1 0.42 0.41 0.4 0.243999226 0.2 0.031415927 1.91637E-05 Copper 36swg 450 0.11 0.1 0.1 0.35 0.37 0.36 0.287444587 0.2 0.031415927 2.00674E-05 Copper 36swg

  2. Investigating the factors affecting the current flowing through a wire.

    This means that the electrons will use less energy and therefore the current will be greater. A diagram of this is shown below. The cross sectional area of the wire will affect the current flowing through the wire. The greater the cross sectional area the thicker the wire.

  1. Investigating a factor affecting the electrical resistance of a wire.

    of the wire. Opposite to temperature, increasing the thickness would decrease the electrical resistance of the wire. This is because increasing the thickness of the wire gives more space for the free electrons to go through over the same distance. Therefore the number of collisions decreases so the resistance goes down.

  2. Factors Affecting the Efficiency of a Wind Turbine

    It was included to test if any round shape can generate good results. It was a control experiment. Apparatus Everything mentioned in the first experiment will be used except for an oscilloscope. A digital multi-meter will be used instead of an oscilloscope.

  1. Discover the factors affecting resistance in a conductor.

    All metals are good conductors. This is because they have a large number of free electrons that can move easily from atom to atom, so therefore a current flows.. A thin wire in a lamp will resist the movement of electrons that is within it.

  2. Factors affecting Resistance of a wire

    Therefore it is a more compatible wire. The rest of the wires that we measured: Table & Graph for 18 SWG (including resistance this time and only at 3 volts) Length (cm) 18 SWG volts 18 SWG amps Average Test1 2 3 Average Test1 2 3 Average Resistance (?)

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