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Effect of temp. on resistance of wire
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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.
Experimentally, the dependence upon these properties is a
straightforward one for a wide range of conditions, and the resistance
of a wire can be expressed as:
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There are a few things that determine the current produced;
* In a conductor, electric current can flow freely, in an insulator it
cannot.
Metals such as copper typify conductors, while most non-metallic
solids are said to be good insulators, having extremely high
resistance to the flow of charge through them. Conductor implies that
the outer electrons of the atoms are loosely bound and free to move
through the material. Most atoms hold on to their electrons tightly
and are insulators.
It is the ability of these electrons to drift from atom to atom which
makes electric current possible.
Other electrons will resist dislodgement and are called bound
electrons. This is known as the free electron theory.
* Temperature has an effect on resistance as the voltage has control
over the temperature.
The more the temperature increases the more the particles vibrate
leading to a reduction in output voltage although not by a huge amount
so this does have an effect.
It is also possible that room temperature may affect our results,
however it shouldn’t.
question: Will the temperature of the water affect the speed of the dissolving Alka Seltzers?
anyway) Note these factors affect the rate of the reaction, but not the final. amount of carbon dioxide produced). Why these factors affect it: higher temperature makes atoms move more. so they are more likely to bump into each other and react.
The first term that I noted during the movie was Conductive Polymers. Conductive polymers are almost always organic meaning a large class of chemical compounds whose molecules contain carbon. These polymers have extended delocalized bonds which are bonds found in a molecule that do not belong to a single atom or covalent bond. They are conjugated systems of double bonds and in a aromatic systems. The conjugated systems are atoms covalently bonded with alternating single and double bonds. When the electrons are removed or added into the valence bands the electrical conductivity increases. The conductive polymer has a low conductivity until the electron is removed from the valence band called (p-doping) or (n-doping) until it becomes more conductive. The movement of the charges is what is responsible for electrical conductivity. These polymers are plastic which are organic polymers and with mechanical properties such as flexibility and elasticity.
[IMAGE] Most reactive Potassium Sodium Lithium Calcium Magnesium Aluminium Zinc Iron Tin Lead Copper ------ Silver Gold Potassium Least reactive Electrical flow through metals work like this: the current in the metal is carried by electrons and will only flow if there charges which can move freely.
equation V = IR. V - volts, I - current and R - resistance. I plotted
An atom, by definition, is the smallest part of any substance. The atom has three main components that make it up: protons, neutrons, and electrons. The protons and neutrons are within the nucleus in the center of the atom. The electrons revolve around the nucleus in many orbitals. These orbitals consist of many different shapes, including circular, spiral, and many others. Protons are positively charged and electrons are negatively charged. Protons and electrons both have charge of equal magnitude (i.e. 1.602x10-19 coulombs). Neutrons have a neutral charge, and they, along with protons, are the majority of mass in an atom. Electron mass, though, is negligible. When an atom has a neutral charge, it is stable.
The purpose of the lab was to show the effect of temperature on the rate of
As the temperature increases, the movements of molecules also increase. This is the kinetic theory. When the temperature is increased the particles gain more energy and therefore move around faster. This gives the particles more of a chance with other particles and with more force.
I also decided to use a wooden block to keep hold of the wire, because
Investigating the Effect the Thickness of a Wire has on Its Resistance. Equipment:.. Nickel Wire cut into 10 pieces of 30cm length (Ruler, Pliers). Two crocodile clips Five Pieces of Wire Power Source Variable Resistor Ammeter Volt Meter Method: The.. =
However, the decrease varied depending on the temperature. The lowest temperature, 4 degrees Celsius, experienced a very low decrease of amylose percentage. Temperature at 22 degrees Celsius and 37 degrees Celsius, both had a drastic decrease in amylose percentage. While the highest temperature, 70 degrees Celsius, experienced an increase of amylose percentage. In conclusion, as the temperature increases the percentage of amylose decreases; however, if the temperature gets too high the percentage of amylose will begin to increase. The percentage of amylose increases at high temperatures because there is less enzyme activity at high temperatures. However, when the temperature is lower, more enzyme activity will be present, which results in the decrease of amylose percentage. This is why there is a decrease of amylose percentage in 4, 22, and 37 degrees Celsius. In this experiment the optimal temperature is 37 degrees Celsius, this is because this is the average human body temperature. Therefore, amylase works better at temperatures it is familiar
This is know as resistivity. The factors I can investigate are : Ÿ Temperature Ÿ Length Ÿ Cross-sectional area/width Ÿ Material (resistivity) The factor I shall investigate is the length of a wire. Background Knowledge Resistance is when electrons travelling through the wire are impeded by the atoms within the wire. Since the electrons are charge carriers when they collide with the atoms in the wire less pass through.
The Relationship Between Length, Width and Resistance of a Wire Aim: To investigate how the length and width of a wire affects the resistance of the wires. What is the resistance to a s Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. gold has less resistance to the sand. For example, gold has more free electrons than. iron and, as a result, it is a better conductor.
[IMAGE] Ohm's main interest was current electricity. Ohm made only a modest living and as a result, his experimental equipment was primitive. Despite this, he made his own metal wire, producing a range of thicknesses and lengths of remarkably consistent quality. For the nine years he spent at the Jesuit's college, he did considerable experimental research on the nature of electric circuits. He took considerable pains to be brutally accurate with every detail of his work.
2) Cut a length of wire over a meter long and sellotape to a meter