• 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...

Introduction

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.

Middle

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.

Conclusion

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)

    V1 +V2 IR = IR1 + IR2 R = R1 + R2. In relation to length this would become: L = L1 + L2 Owing to the fact that the circuit is in series, there are actually two wires in use that have been connected (using a series connection)

  2. Discover the factors affecting resistance in a conductor.

    For many useful conductors this is a simple rule which connects current, voltage and resistance. Its relationship in this law is that if we double the applied voltage, the current is doubled. If the voltage is halved, so is the applied current.

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

    Different materials have different resistance depending on the materials' atomic structure (composition). The type of material affects the amount of free electrons there are. The number of free electrons depends on the amount of electrons in the outer shell of the atoms.

  2. Factors affecting Resistance of a wire

    We wanted to find out how those two factors affected resistance so we would know what to control in our coursework experiment. The other aim of the experiment was to find out which material and thickness of wire would be the most suitable for our experiment.

  1. Factors Affecting the Efficiency of a Wind Turbine

    Unfortunately it was impossible to use them to investigate the remaining three variables (4,5 & 7) because they were made up of rigid plastic material and are attached directly to the hub. It was impossible to change their shape in any way without damaging them. I designed other blades instead.

  2. Investigation into the factors affecting the resistance of wire

    This is to remove any dirt or other material that could hinder the connection or increase the resistance, whilst not thinning the wire itself. Safety is very important whilst experimenting with electricity. The main safety device in my experiment is the circuit breaker in the power supply.

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

    A diagram of this is shown below. A short piece of wire has less ions so there will be fewer collisions causing the resistance to be lower. This will cause an increase in the current as charges will move faster through the circuit. The electrons drift though a shorter distance so therefore there will be less collisions over the shorter distance.

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