• 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)

    These resistors are said to be in parallel, and as before, it is possible to consider them as one single equivalent resistor R. To find this equivalent resistor, we exploit the fact from Ohm's law, that the potential difference across R1 and R2 is the same, we find this becomes:

  2. Discover the factors affecting resistance in a conductor.

    This does not apply for all conductors, but it will work as long as the temperature remains constant across the conductor. Although this sounds complex, Ohms Law means: 1. A steady increase in voltage, in a circuit with constant resistance, produces a constant linear rise in current, as shown in

  1. 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 (?)

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

    Metals behave as conductors due to their structure. In a metal atom, the electron is relatively weakly attached to the atom and so can easily separate from the parent atom. This means that the atoms in a metal exist as ions surrounded by an electron cloud. When a potential difference is applied to the metal, the electrons in

  1. Factors Affecting the Efficiency of a Wind Turbine

    TEMPERATURE OF AIR This is another factor that affects the efficiency of a wind turbine. Hypothesis When the temperature of air is increased, the rate of collisions between the air molecules increases. This makes molecules of air collides faster and more often with the turbine's blades.

  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.

    The final variable is the length of the constantan alloy wire, which is what I am going to investigate. Preliminary Work: The preliminary work I plan to do will investigate which thickness of wire is best for the investigation. It will help me to carry out my investigation by showing

  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