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# How the resistance of a filament bulb varies its current flowing through it

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Introduction

Filament Bulb Investigation

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.

Middle

Brightness

Resistance

1

0.004

N

250

2

0.01

N

200

3

0.02

N

150

4

0.03

N

133.3

5

0.06

N

83.3

6

0.08

N

66.7

7

0.09

VVD

77.7

8

0.11

VD

72.7

9

0.12

D

75

10

0.14

D

71.4

11

0.15

N

73.3

12

0.17

N

70.6

Data Processing-This is my result over as you can see from the reading of the ammeter, the difference while increasing 1 volt isn’t much. The pattern shows two is amps is added frequently or 1. The brightness level in this experiment wasn’t that exciting as in the bulb lit up

Conclusion

Conclusion- as for conclusion I would say the higher the voltage the brighter the bulb gets. However, in our experiment at a point the bulb burst because it could not take anymore.

Evaluation- Like all experiments this experiment had human errors too for example while we took the result of the ammeter it changed, as in there was 1dp difference therefore I would count that as the only human error. Since it did not include a lot of difficult measurements there was no human error. I could have definitely improved on this investigation if I did it with more bulbs than it would clearly show my point. The validity of my result would surely make my results more accurate. If I got the opportunity to do this test again I would perhaps use the mille ammeter which would give me a more detailed accurate reading.

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