• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11

A technician has the problem of making wire resistors of various values. Plan and carry out an investigation to help the technician solve the problem.

Extracts from this document...

Introduction

Statement of the problem.

A technician has the problem of making wire resistors of various values. Plan and carry out an investigation to help the technician solve the problem.

Background

Resistance is the property of a material, which opposes the current through the material. The larger the resistance the smaller the current flowing through the circuit. Resistance is measured in ohms (Ω). To find resistance we use the formula: resistance = voltage / current  (R=V/I)

To find the current we must use an ammeter and to find voltage we must use a voltmeter.

 In series circuits the total resistance is just the sum of all the resistance’s. In a parallel circuit the current through each component depends on its resistance. The lower the resistance the bigger the current that’ll flows through it.  

Variables

There are four variables:

  1. length
  2. temperature
  3. material
  4. cross section area of wire

I am going to test number one, the length of wire.

Predictions

I predict that has I increase the length of wire, the resistance will also increase.

...read more.

Middle

4

5

6

How that I have carried out my experiment I must draw tables and from the tables draw graphs.

Tables

30cm table

Voltage (Volts)

Current (Amp)

Resistance (ohm’s Ω)

1

0.17

5.88

2

0.31

6.45

3

0.5

6

4

0.61

6.56

5

0.79

6.33

6

90cm table

Voltage (Volts)

Current (Amp)

...read more.

Conclusion

 Resistance opposes the flow of electricity through my circuit. If I increased the length of wire I would have a greater resistance, this is because the electrons are being slowed down by other particles in the way. So if you increase the resistance you decrease the current.  

Improvements

I would carry out the experiment again this time using more wire to see what change that would do to the results and the averages. I might also do the experiment again, but this time increase the length of wire. To see what effect this has on the experiment.

 The technician would use my graphs to find out how much wire he/she would need for each resistance.

 Take for example if the technician wanted to know how much wire he/she would need for 20omh’s he/she would use the graph by going up 20omh’s in the graph and go across until he/she met the line and then go down. The length of wire in this case would be 90cms.      

...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. Peer reviewed

    electomagnet lab

    3 star(s)

    * Rusted iron nails should be handled with care so that they don't poke the body. If they do, one must immediately get a tetanus vaccine. * The entire wire should be insulated excluding the part that is connected ti the power supply.

  2. Electromagnet lab

    * A pure iron nail should be used to make sure that the nail does not retain its magnetism. MODIFICATIONS: * The clamp stand was not used because the length of the wires in the circuit was too less to be suspended from the clamp stand.

  1. Resistance of a Wire Investigation

    Otherwise, the rate of photosynthesis can no longer increase. Prediction: I predict that increasing the light intensity will increase the rate of photosynthesis at a proportional rate where LI is inversely proportional to 1/d2 when LI= light intensity and d= distance (from light source to plant). This is true to a certain point until another factor is limiting the rate of photosynthesis.

  2. Investigating resistance of resistors in series - What effect, if any, does the length ...

    This is because the longer the wire, the more times the free electrons (that have energy) will collide with the fixed electrons, the particles making up the metal, and any impurities in the metal. Therefore, more energy is going to be lost in these collisions (as heat).

  1. Electrician asked to repair an old radio. He believes that he needs a resistance ...

    There are more atoms in a longer piece of wire and therefore more collisions must occur to pass on the electron flow, so for a longer length there will be more collisions, therefore higher resistance. Resistors in series; V= V1 + V2 as the current is the same throughout.

  2. A manufacturer of resistors uses a variety of wires to make resistors of fixed ...

    Dependent Variable: The quantity we will measure when we change the length will be the resistance. Controlled Variable: The quantities which I will keep the same will be the thickness, material, resistivity and temperature. List of Apparatus: 1 Power Supply Unit 1 Rheostat 1 Ammeter 1 Voltmeter 1 length of

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