Resistance in a Wire
I have been asked to investigate what factors could affect the amount
of resistance in a wire. For this investigation, I believe that
altering the length of the wire throughout the experiment will be the
best method.
Investigation into how the Length of Wire in a Circuit affects the
Resistance
Planning Section
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Science Theory
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The information in the Science Theory section and the Prediction was
taken from Nuffield Co-ordinated sciences and The Usbourne Illustrated
Dictionary of Science. The various factors that could affect the
resistance in a wire are as follows.
The thickness of the wire - if a wire has a diameter of 4mm then there
will be more space for the electrons to move in and electricity can be
passed quicker that in a wire with diameter of 2mm.
The material the wire is made of - if the wire in question was made
from gold, which is an excellent conductor for electricity as it has a
large number of electrons that move freely, so the electricity passes
from one atom to the next.
Voltage - Voltage may also be linked to the amount of resistance in a
wire as the more electricity there is trying to get through the wire
the harder it will be as there will be less space for it to fit
through, so therefore there will be more resistance.
The length of the wire - for example if you obtained a small stretch
of wire say 3 cm long then there will be less resistance than a wire
that is 30 cm long. The reason behind this is that if the electricity
only has to travel a short distance then there are potentially fewer
atoms that could slow down the electricity flowing through the wire,
however if it is a longer piece of wire made of the same material then
there should be 10 times more resistance than in the 3cm length wire.
Prediction
Due to Ohms law stating 'The current in an object at constant
wouldn’t work or it would be very hard to pull off. But if the lights
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.
These include, high strength, low weight, high chemical resistance and high cut resistance. This material does not corrode or rust and is also unaffected when placed in or under water.
I also decided to use a wooden block to keep hold of the wire, because
This begged the question for the “Mad scientist”. How can the world supply itself with electricity without giant power cords, so Nikola started experimenting. He came up with the hypothesis that he could use 2 metal rods.
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.. =
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.
...k again. Inspectors do this because over time the electricity passing through a bad wire damages the wire even more in can result in a fire. The fire could cost the owner lots of money in repairs or on appliances and furniture.
Twisted copper wire, also known, as the common telephone wire is very similar to the wires used in telephone systems. However, the twisted pair wire required for reliable data transmission is of a heavier gauge than the telephone wire. It uses 24 to 26 AWG (American Wire Gauge, www.datapro.com). The purpose of twisting the copper wires together is to minimize the interference between the two adjacent wires. Otherwise, there would be too much line noise to transfer voice or data efficiently. There are two different types of twisted pairs that are used to transmit data. The STP (Shielded Twisted Pair) and the UTP (Unshielded Twisted Pair). Just like it sounds, the STP is a special kind of copper telephone wiring used in some business installations. An outer covering or a shield is added to the twisted pair acting as a ground. This process shields the twisted pair from EMI (Electro-magnetic Interference), which will disturb the data transmission greatly. The UTP is just a twisted pai...
Knowing the information given in my introduction, I can hypothesise on two things. 1) The more paperclips there are, the greater the acceleration will be. 2) The shorter the rotor length is, the smaller the resistance will be.
Edison searched for the proper "filament" or wire, that would give good light when electricity flowed through it. He sent people to the jungles of the Amazon and forests of Japan in his search for a perfect filament material. He tested over 6,000 vegetable growths (baywood, boxwood, hickory, cedar, flax, bamboo) as filament material.
Optical Fibers are of very small diameter like a human hair. There diameter is 125um whereas of copper cable it is 0.8mm.
Numerous factors influence electrical conductivity and resistance, two of them are temperature and length of the wire (these are external factors). Electrical conductivity is defined as the property used to describe how well materials allow electrons to flow, and the degree to which a specific material conducts electricity., Electrical conductivity is calculated as the ratio of the current density in the material to the electric field that causes the flow of current. The SI unit of electrical conductivity is Siemens per meter (S/m). Electrical conductivity is also commonly represented by the Greek letter σ (sigma), but κ (kappa) (especially in electrical engineering) or γ (gamma) are alsowhich are occasionally used. Electrical resistivity quantifies how strongly a specific material opposes the flow of electric current. Electrical resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m) although other units like ohm⋅centimetre (Ω⋅cm) are also in use.
Coaxial cables may be rigid or flexible. Rigid types have a solid sheath, while flexible types have a braided sheath, both usually of thin copper wire. The inner insulator, also called the dielectric, has a significant effect on the cable's properties, such as its characteristic impedance and its attenuation. The dielectric may be solid or perforated with air spaces. Connections to the ends of coaxial cables are usually made with RF connectors.