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

What factors influence the resistance of a wire?

Extracts from this document...


What factors influence the resistance of a wire? Aim: To devise and carry out an experiment to show how one factor influences the electrical resistance of a wire. Plan Factors The factors which affect the resistance of a wire are: * Length of wire * Diameter of wire * Temperature * Material of the wire * Current in the wire Background information Resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long. If the resistance in a circuit is high then a lot of energy is used up getting the current through. This energy is mainly changed into heat. An electric heater uses this to produce heat. Another use of resistors is to protect delicate electronic components. If you want to keep the current small to avoid damage, you put a resistor in the circuit with the component. The resistor makes it harder for current to flow and so less will flow. The unit of resistance is the ohm symbol ? large resistances are measured in thousands or millions of ohms. ...read more.


30cm - 40cm - 50cm - 60cm - 70cm - 80cm - 90cm - 100cm * Using the formula R=V I I will work out the resistance. * I will then repeat the experiment two more times, to make sure my results are reliable. Diagram Equipment Connecting wires Power pack on 2V 1 meter of 0.475mm nichrome wire Crocodile clips Ammeter Voltmeter Safety This is not a very dangerous experiment but despite this I will always handle electricity with care, keep the current low and handle with dry hands. Fair Test To keep this experiment as fair as possible I need to make sure that the length of the wire is measured precisely from the inside edge of the crocodile clips, making sure that the wire is straight when I do this. As if I do not do this all of the time then each time I repeat the experiment I will not be using the same length of wire, therefore making it unfair. I must also make sure that the wire is straight when we conduct the experiment. If it is not, then it may short circuit, also bends and kinks in the wire may affect the resistance. The reading that I take of the voltage should be done fairly promptly after the circuit is connected. ...read more.


is difficult to get an accurate reading of length by eye, as the wire might not be completely straight, it may be of different thickness throughout the length. The method used was good, it got the expected results and the anomalies that occurred were not due to a fault in the method,, but the evidence achieved from this were enough to support a firm conclusion. If I was to do the experiment again, I would use a more accurate method of measurement and also use a rheostat to create even more accurate results. By taking a much wider range of readings and more readings so that a more accurate average can be taken the reliability of the results would improve. I would also let the wire cool down sufficiently in between readings. When the wire heats up, it has lots of energy, which causes the atoms in it to vibrate, making it harder for the electrons to travel. This increases the resistance via another method, so it is not a truly fair test. I would also investigate other factors, such as temperature, thickness, current, and material to see how these would affect resistance in a wire. I would also do the experiment under different conditions such as temperature and pressure to see if they make any difference to the resistance. ...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. Resistance of a Wire Investigation

    Even then, some of the light from the lamp in my experiment would reflect of the table and reach the plant though this amount of light is probably insignificant in affecting the rate of photosynthesis. Temperature was also another factor that was controlled by the lamp being used.

  2. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    I will also have to make sure that I wear rubber soled shoes since the quickest way for electricity to flow through to the earth is through me, so if I wear rubber soled shoes, the electricity cannot pass through me.

  1. Investigating factors that affect the resistance in a circuit, specifically wire components.

    Resistance occurs by free electrons bumping into stationary ions. The movement of the electrical charge is called the current. The current is the rate the charge flows around the circuit. The more 'push' emitted from an electrical source e.g. battery, the larger the current.

  2. To investigate the influence of the length of a eureka wire on it's resistance.

    When you do apply voltage the electrons start drifting slowly along and they are moving in the same direction. There is an important temperature called absolute temperature, which is 273� C. Atoms below 273�C do not vibrate, and everything above it does.

  1. An investigation into the factors affecting the resistance of a wire.

    I can now work out the resistance using the current and Voltage: R=V/I (ohms law) R - resistance in ohms (?? ohms) V - voltage (volts) I - current (amperes) I have discovered the circuit itself can resist the flow of particles if the wires are either very thin or very long.

  2. Investigating the factors affecting the resistance in a piece of wire.

    Now 1 will make sure the power pack is off and insert the first wire at point x on the circuit diagram. Now I will turn on the voltmeter and ammeter. 3 Next I will turn on power pack and record the first ammeter and voltmeter readings.

  1. 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.

  2. The aim of this investigation is to investigate the factors affecting the resistance of ...

    possibly one that contains a bulb, and takes the easiest route, providing that there is another wire at two points. In a series circuit, the resistance is calculated using the formula: R = R1 + R2 + R3 ... In a parallel circuit, the resistance is calculated using the formula:

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