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Investigating electrical behaviour and a filament lamp.

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Investigating electrical behaviour and a filament lamp.image00.png

Aim: My aim in this investigation is to find electrical behaviour of a resistor and a filament lamp.


Apparatus:  Below are the following equipment used throughout the experiment:

  • Resistor
  • Filament Lamp
  • Ammetre
  • Voltmetre
  • Power Supply
  • 5 wires


Prediction: I predict that for the filament lamp as soon as the voltage increases, so will the resistance. This is because the filament gives out light, when the temperature of filament is increased. The filament lamp gives out heat because an electric current is passing through the components lamp. As the filament increases in temperature, the particles start to vibrate more. The vibration causes difficulty for the electrons to pass through.

                I assume that the filament may need a certain amount of electricity / energy before it can give any heat or light out. The filament lamp needs to be at a certain temperature in order the lamp can give out any light or heat. If we were to draw a graph it would be curved. This is because the filament lamp gives out so much of light and heat. This one reason that graph of a filament lamp is curved.

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Variables: For this experiment I would expect to have 3 different variables, Independent, Dependent, and fixed variables, which all helps me to plan and explain the experiment thoroughly.

Independent variable (which you can change): The thing that I will change in this experiment is the voltage from the power supply. This affects the filament and the resistor. By changing the voltage to see the different results for the volts and amps. The ranges I will be using are from 2 – 12 voltage.

Dependent Variable(objects/items that you measure): The thing that I will be measuring is the volts and the amps as I change the voltage from the power supply.

Fixed Variables(objects/items that will remain the same): the thing that I will be keeping the same to keep it a fair test is the equipment. By keeping the equipment the same it will able me to gain the best results.

Safety:Throughout your experiment safety was our main concern at all times. If the equipment was not to work and we would get a small electric. This could be dangerous.


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Evaluation: In my opinion the experiment went well. I gained a good set of results and altogether I am pleased with the investigation. The aim of the investigation was to find electrical behaviour of a resistor and a filament lamp. I did this productively. There is a strong pattern for the results I took down, which I then plotted to form a graph.

                The experiment was easy to set up and to do, but all results had to be recorded accurately. In-order to gain a fair test. The most difficult part of the whole experiment was to record my results down. This was because the readings from the ammeter and voltmeter kept on going up and down. This maid it hard to read of the results from the ammeter and voltmeter. This could have affected my overall results. The other difficulties I had were to record my results from the voltmeter and ammeter into amps and volts.

                If I were to repeat the same experiment again I would try and ensure that I would find a better way to read of from the ammeter and voltmeter. In-order to have the best accurate results ad to do this in a fair way.


Modular Science for AQA (2001)

Science Revision Book AQA

Kamal Dodia 11R         Sciences Physics          -  -

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