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The aim of my experiment is to see how the resistance of a filament bulb changes with temperature. I am trying to find out if the filament bulb obeys ohms law.

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Year 10 Coursework

Filament bulb

Aaron Evans

The aim of my experiment is to see how the resistance of a filament bulb changes with temperature. I am trying to find out if the filament bulb obeys ohms law.

My Apparatus

·        Power pack (2v-12v)

·        Filament Lamp

·        Variable Resistor

·        Voltmeter

·        Ammeter

·        Wires

The Circuit looks like this :-

Variable :- My Variable is the variable resistor i will change this a total of eight times I am keeping the powerpack the same all though the expirment. the variable resistor will give diffrent readings i change it, eight results should be sufficiant.

Fair Test :-To keep this a fair test  i will keep the circuit the same use the same bulb same powerpack same variable resistor same ameter, wires and voltmeter i will chanage the variable resistor equally though the experiment, and the voltage on the powerpack will be the same all the way though.

Messure :- In my experiment, the voltage(V) and current(I). The voltage is measured in volts with a voltmeter.

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Fig 1) I will then start by postioning the variable resistor at it’s lowest point then move it constantly every time I move it I will read what the voltmeter and ammeter say and note them done I will leave the power pack on     Volts.

I will then plot the results on a graph. my reason for doing this is to find out If

the filiment bulb obeys ohms law and to work out the resistance. Finally I will not reapeat the test because, it would not be fair to, due to the fact that i can not always postion the variable resisotor in the same place.

Prediction :- I belive the resistance will vary with the increase of temperature. I think this because my componets have a fixed value of resistance only if the tempertaure stays the same. If the temperature  increases, the paficies in he wire will vibrate making it harder for electrons to pass though because resistance increases. The more power the lamp gets. the hotter it becomes.

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A thicker wire has less resistance than a thin wire. Because is has more space to get though, thus not hitting as many ions. The resistance also depends on what material it is made of, copper for exaple is a better conductor than steal but steel is better than silicon.

To work out resistance resistance we need to take into account, the length,area,shape and the material. Resistivity is the relevant property of a material. the symbol is; P (Greek- letter R)


Evaluation :- I found it easy to wire the circuit and take results although, it was hard to understand resitivity. My results came out find i did not find one anomaloys result but if I had it could be down to the use of a diffrent bulb the variable resistor had been moved to far or to less, the room tempreature could make a slight diffrent. if i had more time i would have changed the voltmeter and not the resistor and reapeted the experiment.

...read more.

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