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

Resistance is a measure of how hard it is to get a current through a component at a particular potential difference or voltage.

Extracts from this document...

Introduction

Year 10 Coursework-Resistance Assessment Resistance is a measure of how hard it is to get a current through a component at a particular potential difference or voltage. Potential difference , current and resistance are related using this formula: Potential Difference(volt, V) = Current (ampere, A) x Resistance (ohms) Prediction: I predict that the shorter the resistance wire, the less resistance there will be, I also think that this will mean the lower the resistance the higher the current will be. Hypothesis: I think what I have put in my prediction is true because the greater the resistance of a substance the less current it will allow to flow through the given voltage. We can use an equation to work out the amount of current able to flow through a circuit at any one time Current = Voltage Resistance I think the less resistance wire used, the easier and quicker the current will be able to flow through the circuit. This is because their will be less of a resistance stopping the electrical current getting through. ...read more.

Middle

I could set the amp meter or voltmeter to the wrong setting which could make my results inaccurate. I think that the less resistance wire used, the easier and quicker the current will be able to flow through the circuit. To make my planning easier I have done work even before I wrote this assessment, I have found out that resistance is a measure of how hard it is to get a current through a component at a particular potential difference or voltage, I learnt this from the AQA Double Award Modular Science- The Tested Modules (Higher Tier Book). Also I found out that Potential Difference(volt, V) = Current (ampere, A) x Resistance (ohms) Is the way to work out how current and resistance are related. Fair Test: To make sure the test is fair I will keep the voltage on the power pack the same throughout the experiment. Also I will make sure the readings on the voltmeter and amp meter are always recorded how each metre says and not change them to make the results more accurate. ...read more.

Conclusion

I measured the resistance wire to the 200 cm and used a crocodile clip to connect it to the meter ruler. I then turned the power pack on and recorded the readings on the amp meter and voltmeter as shown in my tables of results. I repeated the experiment for the other resistance wire measurements. I did each measurement twice to make my results more accurate. To work out the average for each length of resistance wire I took both sets of results and first looked at the 200cm results I used both them and did this formula to work out the resistance: R= V divided by C I then repeated the formula to work out the other results. I then recorded the averages on my table. Tables Of Results Length (cm) 200 190 180 170 160 150 Voltage (V) 3.56 3.56 3.53 3.48 3.44 3.39 Current (amps) 0.39 0.43 0.47 0.50 0.54 0.59 Resistance (ohms) 9.12 8.27 8.27 6.96 6.37 5.74 Length (cm) 200 190 180 170 160 150 Voltage (V) 3.54 3.57 3.55 3.47 3.44 3.30 Current (amps) 0.39 0.95 0.46 0.49 0.54 0.50 Resistance (ohms) 9.07 8.30 7.11 7.08 6.57 6.37 Averages 9.095 8.285 7.51 7.12 6.37 6.055 Diagram Of Apparatus Jamie Noke 10 ANS Yr10 coursework Physics Mr Tebay 10S ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics 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 AS and A Level Electrical & Thermal Physics essays

  1. Thermistor Coursework

    When I am deciding what fixed resistor to use in my sensor I will think about the factors listed below. I have decided that I shall use a 1000? thermistor. This is because they are fairly common, and should the thermistor fail it is easily interchangeable.

  2. Characteristics of Ohmic and Non Ohmic Conductors.

    Planned Equipment Provided Equipment Nichrome Length - 60 cm Length - 80 cm Thickness - 0.5 mm Thickness - 0.45mm Aluminium Constantin D.C Supply Battery/Cell Besides that I will not perform the experiment on the LDR. In addition the bulb holder was not needed so I did not use that to investigate the IV characteristics of the filament bulb.

  1. Relationship between the current and voltage.

    As the resistance, of the, " wire wound resistor," will be a constant, I expect a straight line graph. There I also expect the resistors to be applicable to ohms law. This is, as the temperature of the resistors will be kept constant, as the voltage will not be very high.

  2. Experiment on Resistance - different lengths of wire.

    This is because with the longer wire, there are much more atoms for the electrons to collide with and cause resistance. Also, there is already more resistance put into the circuit than what there needs to be.

  1. Investigating the effect of 'length' on the resistance of a wire

    In other words, its resistance = constant (resistivity) �length Area of cross-section The constant depends on the type of material and is referred to as the resistivity of the material. The unit of resistivity is the ohm metre (?m). The symbol for resistivity is the Greek letter ?, pronounced 'rho'.

  2. resistivity if a nichrome wire

    This therefore becaie R= V/I For example: (0.100m length) R= V/I 0.37 / 0.24 = 1.54 4.05% + 4.17% = 8.22 % Therefore this will become: 1.54 ? 8.22 % After I done all of there calculations I plotted a graph of resistance errors. This will enable me to work out the gradient errors and therefore the errors of the resistivity of the nichrome wire.

  1. physics sensor coursework

    �10^-3] Max value = 200.43 ? Min value = Min V/ Max I Min value = (3.61 - 0.005)/ [(18.97 + 0.005) �10^-3] Min value = 189.99 ? Error max = (4.89/ 200.43) �100 Error max = 2.44% Error min = (5.55/ 189.99)

  2. Physics coursework

    At higher temperatures, more atoms are ionised, and the conductivity rises. Apparatus: Apparatus Reason Thermistor To find out how the resistance of the thermistor changes as the temperature increases. Power pack The source of power of the circuit, so that the thermistor works and also to find the resistance of the thermistor.

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