The Change in Resistance of a Carbon Paper
Introduction
The aim of this experiment is to see how the resistance of a
carbon-coated piece of paper changes when the different variables
change.
Variables
A variable is a change in an experiment that could alter the
outcome/results of that experiment, and for this experiment the main
variables are type of paper, width of paper, length of paper, and
temperature.
We are going to be studying how changing the width of the paper
affects the resistance, and so to ensure a fair test we will have to
keep all of the other variables constant, as if they were also
changing the results could be affected and the experiment would not be
of any use. We will therefore keep the type of paper the same (which
is easy), will keep the length of the paper the same for each
experiment (which is also easy), and also keep the temperature the
same, as we will simply not change the heat of the room (ie. Starting
fires, turning on the radiator, opening windows, etc).
We will change the width of the paper for each experiment by simply
cutting off 1cm horizontally for each experiment, so it will go 4cm,
3cm, etc. We will do this accurately and carefully with a ruler and
scissors, to ensure accuracy,
Prediction
I predict that as the width decreases, the resistance will increase,
and as the width increases, the resistance will decrease. I predict
this because if the paper has a large width, there will be more room
for the current to flow through, and so the resistance will be less,
whereas if the paper is thinner, there will be less room, and the
resistance will increase. I also predict ...
... middle of paper ...
...ted to be really accurate) doing each width 5 times, and we
also could have done more widths, perhaps doing an experiment every
1/2cm instead of whole cm.
Further Experiments
For further experiments we could have investigated how length affects
resistance, and would probably find that they were directly
proportional, and as the length increased so would resistance, as the
more the electricity has to flow through the more resistance it will
encounter.
We would do this experiment by, after finding the appropriate shunt,
finding an appropriate width to use, to place the ammeter reading at
the low end of the scale, for reversed reasons as for the width
experiments. We would then choose a length and gradually reduce the
length, taking recordings. Everything else would be the same as the
width experiment.
Then we will remove the cell and connect point A to point B, at the
The reason I will test my theory is so I can see if ohm's law was
There have been many means and methods in the past decade, fostered to ensure that the construction of buildings, complexes and many enormous structures are made with energy saving measures such as heat dispersal during the summer, and to also ensure the promotion of environmental sustainability such as the control of carbon emissions and greenhouse gases. And by the use of complex and highly innovative building materials like carbon fiber, such feet can be achieved.
Carbon exists in different forms such as graphite, amorphous carbon, and diamond, among others. Its graphitic carbon has a hexagonal and crystalline structure that easily cleaves which in turn makes it a soft material and effective lubricant. Its widely occurrence in earth’s crust makes it one the most abundant elements. Carbon presents itself in different allotropes such as Graphene, fullerenes and carbon nanotubes. Some of these allotropes have proven to be conducting and others to be semiconducting depending on their chemical nature (Ramuz & et al, 2012). Because of the abundance of carbon, carbon- based materials can be produced cheaply and in large quantities. In addition, carbon exhibits electrical and optical properties
I also decided to use a wooden block to keep hold of the wire, because
To investigate how the resistance of a wire is affected by the length of the wire.
Sweating and Heat Loss Investigation Aim To find out whether heat is lost faster over a sweaty body compared to a dry body. Apparatus 2 Boiling tubes 47ml max 2 Measuring jug 50ml max A Beaker 250ml max 2 thermometers Paper towels A kettle to boil water A stopwatch 2 magnifying glasses (8x) 2 corks with a small hole through the centre A test tube rack Preliminary work In my preliminary work, I need to find out how much water to use, whether the tissue should be wet with hot/cold water, how often the readings should be taken, how accurate should the readings be, how many readings should be taken and what my starting temperature should be. My results are as follows. Starting temperature of 40°c Time (secs) Wet towel (°c) Dry towel (°c) 30 36 38.9 60 35 38.5 90 34 37.9 120 33.9 37.5 150 33 37 180 32.6 36.9 210 32.3 36.8 240 31 36.5 270 30.4 36 300 30.3 35.9 Starting temperature of 65°c Time (secs) Wet towel (°c) Dry towel (°c) 30 51.1 53 60 48.2 51.9 90 46.4 51 120 46 50 150 44.3 49 180 42.9 48.4 210 42.6 46.9 240 41.7 48 270 40.2 47.5 300 39.3 47 Starting temperature of 60°c Time (secs) Wet towel (°c) Dry towel (°c)
The purpose of the lab is to find the change in velocity and acceleration of the toy car. We predicted that as the distance the car will travel the longer it will take to get there. We also predicted that graphs for speed and acceleration will be the same and will have a constant motion. After taking data and recording the different trials our prediction was sort of true. As the distance increases the time increases as well. For example 60 cm took an average of 1.28 seconds, 70 cm took an average of 1.508 seconds, 80 cm took an average of 1.89 seconds, 90 cm took an average of 2.076 seconds, and 100 cm took an average of 2.34. We were correct when we predicted that the graph for speed and acceleration would both have a constant motion because
Two basic principles of fluid dynamics underlie all objects in flight: The forces of Lift, opposing the downward acceleration of gravity, and the forces of drag due to air-resistance. Both forces, properly harnessed and controlled lead to such ingenious devices as the parachute and the helicopter. Aerodynamics, the field of fluid dynamics involving the flow of gasses, even has applications in fields as separate as the automotive industry, fire-safety, and golfing.
F Another wire, or exact same properties (Nickel Chrome, thickness 34). mm and length 30cm) was placed on top of the previous wire, in the same position, both straight and flat. F. The power was turned on again and the same procedure was repeated. recording current and voltage at three points on the variable. resistor.
of the atoms, so if there are more or larger atoms then there must be
There fore less current passes through with the same voltage. Simply it is how hard it is for the electrons to pass through the wire. Temperature: When the metal wire is heated , more energy s given to the atoms, therefore they vibrate more. From this there is a greater chance of collisions with the electrons and they are impeded more, therefore less charge is passed by the electrons and the resulting current is reduced. This means while conducting the experiment the temperature of the wire must be kept constant to maintain a safe and fair test.
Paper Airplanes, flight at its simplest for humans. As kids, we learned how to build paper airplanes and send them soaring into the sky. We didn't stop to think about why the airplanes where able to fly after the initial thrust we gave them or how they were able to glide for so long afterwards. Ignorance was bliss then, but now we strive to understand how things work. Looking back to the childhood past time of flying paper airplanes, I will try to explain some of the parts that make paper airplanes fly.
Investigating the Resistance of a Wire We have been given the task to investigate the resistance of different wires, I am firstly going to start by explaining what resistance is, why it occurs, what causes it, and how it can be used to our advantages. Resistance is a term used to describe the property that various materials possess to restrict or inhibit the flow of electricity. Whether or not a material obeys Ohm's law, its resistance can be described in terms of its resistivity. The electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made.
In order to decide upon the voltage and lengths of wire to use in the