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

An investigation to find out if the length of a wire affects the resistance in a circuit.

Extracts from this document...

Introduction

An investigation to find out if the length of a wire affects the resistance in a circuit……

Introduction:

In this experiment I will investigate how resistance is affected in a circuit. I will be testing in this experiment how the length of a wire affects the resistance in a circuit by using only one variable which is the length of a wire used; the other variables will be fixed such as the voltage at 4V, type of wire (which metal, thicknesses, etc.) The resistance will be calculated using this equation:

Resistance  =  voltage (in volts, V)

        (In ohms Ω)     current (in amps, A)

Aim:

To investigate how resistance is affected in a circuit.

  • Plan the investigation
  • Collate and represent the information produced
  • Use the information to produce an evaluation

Fair testing/variables:

Variables:image00.pngimage01.png

  • Length of wire (C)
  • Thickness of wire (S)
  • Metal wire is made of (S)
  • Shape and pattern of wire (S)
  • Voltage that flows through the circuit (S) at 4V
  • Temperature of wire (S)
  • Components in the circuit (S) at 3 components
  • A.C or D.C current (S) at D.C

Fair testing:

I will make my investigation a fair test by following procedures:

  • Using the same apparatus throughout the experiment
  • Same ammeter, power pack, crocodile clips
  • Accurately measuring the length of wire
  • Reading the ammeter accurately
  • Using new wire because the wire can get hot every time you run current through it so it could change shape or get thinner this may also so be a crucial reason for anomalies.
...read more.

Middle

image13.png
  • Neutrons (with no charge)
  • Protons (with a positive charge)
  • Electrons (with a negative charge)

The protons and neutrons form the nucleus of the atom and the electrons from a shell type enclosure. The structure of this atom is vital, in fact crucial to the understanding in how current and voltage work. I discovered using scientific information that the movement of electrons creates an electrical charge meaning that the more movement increases the charge and the current gets bigger. The energy in a circuit that is given off powers the electrons to move while being pushed thus the circuit is complete.

As shown in diagram C the resistance is affected by every single component which uses up the energy held by the charge from when it received it from the cell. This indicates that the push changes through out the circuit and is lost from the cell meaning the push is all ways changing and that the experiment can only be accurate to a certain degree.

Another factor effecting the experiment is which metal the coil of wire will be made out of and that the same should be used every time because every metal has its own no.

...read more.

Conclusion

        On the other hand many good precautions were taken such as taking three reading so that they could be averaged and more accurate results. Also I used the full readings and then put them to two decimal places at the very end.

        Overall this investigation was very well balanced and that the good points cancelled out the problems. I am very pleased.    

Usman Mirza 10s

...read more.

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 Investigation

    Resistance is often considered as localised in such devices as lamps, heaters, and resistors, in which it predominates, although it is characteristic of every part of a circuit, including connecting wires and electric transmission lines. The spread of electric energy in the form of heat, even though small, affects the

  2. Planning Experimental Procedures

    I might not be accurate on the numbers, but I am just predicting the trend. I predict that when I try the copper wire it will be very hard to collect results because the readings from 5cm-50cm will not have a big difference.

  1. Physical - Circuit

    And the constantan wire with 5 centimetres was heating up, and it changes its colour from silver into golden red and very shiny. This is the first time and the last time this mistake happened in our experiments. By resetting up the circuit, we learned about how to use a variable resistor.

  2. How Is Resistance Affected In a Circuit

    a greater or smaller current either way it will result to inaccurate data and it will no longer become a fair test. * Keep current the same. This is the same reason for the power supply. If the current is changed then it will adjust the flow of electrons giving inaccurate data.

  1. An investigation to find out how the length of wire affects its resistance

    Metal can conduct electricity well because their atoms do not hold on to the electrons to well. Free electrons carry a negative charge when they collide with ions they transfer some of there energy, this transfer when they collide causes the resistance.

  2. Aim: I am going to carry out an investigation to find how the resistance ...

    electrons will instantly begin to move through the wire in the same direction (towards the positively charged end) this is an electric current, a current is the flow of charge in a wire or the movement of the negatively charged electrons through the wire.

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