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# What is the effect of, length of, pencil lead used as a dimmer switch?

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## Duong pham

on 13 November 2013

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#### Transcript of What is the effect of, length of, pencil lead used as a dimmer switch?

What is the effect of, length of, pencil lead used as a dimmer switch on a light bulb's glow?
By
Duong Pham

Question & Purpose
My question is if you move the Alligator clip up or down, would it change the light bulb's glow? Would it glow brighter towards the Eraser or the front?
My purpose on doing this project is that making a dimmer switch can be useful in some times. Like if your house has a black-out, you can use the dimmer switch as a source of light.
How my project relates to medical terms is nerves impulses, each pulse is the same size and carries information on the tensity of the signal.When you turn up the dimmer switch on a room light, the nerve impulses from your eye stay the same but the rate where they are generated increases.
How it also relates to medical is when you suffer neck and back injury, the bones reposition themselves the wrong way, and when they stop, it weakens your muscles and reduce vital nerve signals to your body parts. Like a dimmer switch reducing electricity to a light fixture.
Hypothesis
My hypothesis is that if you move the Alligator clip to a different position from the Graphite Core in the number two pencil, then the light bulb's glow would change. Like if I move it from 14 cm to 0 cm, the light bulb's glow would increase.
Abstract
What is the effect of, length of pencil lead used as a dimmer switch on a light bulb's glow?
By Duong Pham
Would the light bulb's glow change if we moved the Alligator clip down towards 0 cm? Would it even light up? That is my problem in the beginning.My hypothesis is that if you move the Alligator clip to a different position from the Graphite Core in the number two pencil, then the light bulb's glow would change. Like if I move it from 14 cm to 0 cm, the light bulb's glow would increase.Procedure- What I will do is get a 9-V Battery, a Number 2 Pencil, Alligator Clips, a small light bulb and the holder, then shave the pencil until it shows the Graphite Core, and attach the Alligator clips from the Light bulb holder to the 9-V battery and another set of Alligator Clip from the 9-V battery to the Graphite Core that I marked 0. And one more set from the Light bulb holder to 14 cm point, and clip it there. Next I will move the Alligator clip from 14 cm on to 13, 12 and so on down and measure the light bulb's glow, which is the illuminance (lux). I will measure it not on an Amplifier, but on a app that is an Amplifier. The data I collected, which I started from 14 cm to 0, each time I went down a cm, the lux was getting higher, once I reached to 0, the lux was greatly increased. If you move the Alligator clip to a different position from the Graphite Core in the number two pencil, then the light bulb's glow would change. Like if I move it from 14 cm to 0 cm, the light bulb's glow would increase (Measured by Amplifier, lux). My hypothesis was right, it did increase the light bulb's glow when I moved down from 14 cm to 0.
When I moved the Alligator clip from the Light bulb holder to the other set of Alligator clip from the 9-V Battery, I noticed a great increase in lux, and the light bulb's shine. Based on what I know and did is that the energy coming from the 9-V has greater power in 0 cm because it is letting out the energy waves there at the graphite core, and the further away where it was released the fewer power the light bulb will glow.
Charts, Graphs, & Photographs
Materials
Light bulb and holder
Alligator Clips
9-V Battery
Number 2 pencil
Ruler
Fine point marker
Light Meter (app)
Paper
Procedures
Results
Conclusion
References
What I will do is get a 9-V Battery, a Number 2 Pencil, Alligator Clips, a small light bulb and the holder, then shave the pencil until it shows the Graphite Core, and attach the Alligator clips from the Light bulb holder to the 9-V battery and another set of Alligator Clip from the 9-V battery to the Graphite Core that I marked 0. And one more set from the Light bulb holder to 14 cm point, and clip it there. Next I will move the Alligator clip from 14 cm on to 13, 12 and so on down and measure the light bulb's glow, which is the illuminance (lux). I will measure it not on an Amplifier, but on a app that is an Amplifier.
When I moved the alligator clip on the pencil lead, the light bulb was glowing. My hypothesis was correct, when I moved it closer to the eraser, suddenly I see the light bulb's glow was decreasing. When I moved it down closer to the pencil tip, the light bulb's glow was increasing, I can tell when I measure the Lux. I could replace the number 2 pencil for a new one, and the 9-V battery, but not the Alligator clips and the light bulb.
As I got the Alligator clip clipped on 0, which where the other set of alligator clip is at from the 9-V battery, I noticed the lux greatly increased.

If you move the Alligator clip to a different position from the Graphite Core in the number two pencil, then the light bulb's glow would change. Like if I move it from 14 cm to 0 cm, the light bulb's glow would increase (Measured by Amplifier, lux). My hypothesis was right, it did increase the light bulb's glow when I moved down from 14 cm to 0.
When I moved the Alligator clip from the Light bulb holder to the other set of Alligator clip from the 9-V Battery, I noticed a great increase in lux, and the light bulb's shine. Based on what I know and did is that the energy coming from the 9-V has greater power in 0 cm because it is letting out the energy waves there at the graphite core, and the further away where it was released the fewer power the light bulb will glow.
14 cm
0 cm
Home of the Internet's Lowest Dimmer Switch Prices. (n.d.). <i>Dimmer Switch</i>. Retrieved November 12, 2013, from http://www.dimmers.net/dimmer_switch.htm