How the Resistance of a Filament Bulb Varies Its Current Flowing through It

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How the Resistance of a Filament Bulb Varies Its Current Flowing through It

Aim: the purpose of this investigation is to find out how the

resistance of a filament bulb varies with current flowing through it.

Hypothesis: I think the higher the voltage the brighter the bulb will

be because then there will be an increase of current and the electrons

are given more energy and more are forced through, therefore the bulb

would be able to resist more. If the voltage increases the bulb will

shine bright because the bulb would have more energy.

Controlled Variable- the controlled variable for this experiment is

number of bulbs because the decision is for me to make.

Independent Variable- the independent variable for this experiment are

the volts, I will be using 1-12v.

Independent Variable- The independent variable would be the reading we

get of the ammeter.

Apparatus-

* 5 wires

* 1 filament bulb

* 1 resister

* 1 voltage meter

* 5-10 crocodile clips

* Ammeter

Method-First of all I drew the circuit so that it easier for me when I

go to set up all the equipment, than I will to connect what to what.

After drawing the circuit I gathered all the apparatus that I need for

this experiment. After setting them what I will have to do is connect

and wire them up so that the circuit is ready to go. I plan to do my

experiment with 5 bulbs to make it fair. However as I can see I don’t

think I will have enough time to get it done therefore I will only do

it for 2 to 3 bulbs. After taking down the Results for that I drew

another circuit which is without the Resister. And started taking down

the Results.

Circuit

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Result- R=V/I this how I figure out the resistance for this

experiment.

1 bulb with a Resister

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