Cgse Physics Coursework Resistance In Wire

1701 words - 7 pages

Resistance in WireMy task is to investigate how the length of a piece of wire affects its resistance.Before we can begin to investigate the effect of length against resistance we have to understand what resistance is and how it is measured:ResistanceElectricity is conducted through different types of conductors, metals, liquids and gases through free electrons. A free electron is an electron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field. The number of free electrons in a conductor will depend on the material from which it is made. If the conducting material has lots of free electrons it will be a better conductor than one with less (more free electrons means less resistance). An example of this is gold compared to a lesser conducting metal such as copper; Gold has more free electrons than copper and, subsequently, it is a better conductor. Unfortunately we can't all afford to have our homes wired with gold so we have to compromise with a cheaper alternative.When free electrons are given energy they move around and collide into other nearby free electrons. When this happens along the whole wire (connected at either end to crate a full circuit) a long chain reaction of moving free electrons is started and so electricity is conducted.Resistance is a property of an electric conductor which opposes a flow of electricity and dissipates electrical energy away from the circuit, usually as heat. This heat is created when free electrons collide with fixed particles, impurities, and other free electrons within the metal. Due to these collisions some of the energy that the free electrons are carrying is wasted as heat energy.How do we Measure Resistance?Resistance in wire is calculated using a simple formula shown below:V = I x RV = Voltage (Measured in parallel)I = Current (Measured in series)R = ResistanceThis can be rearranged to:VR = ---- This is Ohm's LawIOhm's Law states that the potential difference (voltage) and the current being passed between the ends of a metallic conductor (the wire) are at a given temperature proportional. Therefore the resistance in a wire is constant will be the same as long as the wire remains at a constant temperature current is passed through the wire. Also, the resistance of a metal will increase as its temperature begins to do so. This happens because at higher temperatures particles within the conductor are moving faster meaning that they are more likely to collide with free electrons.Variables* Length of Wire.* Starting Temperature of Wire.* Current in Circuit.* Resistance in CircuitI will only have one dependant variable, the length of wire, which will be varied throughout the experiment by moving a 'floating connection' made to the wire with a crocodile clip. My other variables will be kept constant and I will be measuring the resistance in the circuit and how it affects the current flowing in the circuit.I predict that as the length of wire increases,...

Find Another Essay On CGSE Physics Coursework - Resistance in Wire

A Physics Investigation of the Resistance: Of A Piece of Wire?

2289 words - 9 pages Aim:The aim of this investigation is to investigate and discover if the length of a piece of metal wire effects its resistance when electricity is passed through it.PredictionBefore I make a prediction I shall explain about atoms, free electrons, electricity and resistance.Electricity travels through a conductor, in this case a length of wire, by means of free electrons. Electrons are the smallest parts of an atom that is situated in shells

GCSE, Physics: What affects the resistance of a piece of wire?

2625 words - 11 pages with low resistance, the electrons move more freely, as they make fewer collisions. Resistance is a measure of how hard it is to move electrons through a wire. Resistance is a property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current. Resistance involves collisions of the current-carrying charged particles with fixed particles that make up the structure of the

Resistance in a Wire

798 words - 3 pages carry out my experiment I will start with a metre ruler and a piece of Nichrome wire taped at each ends. I will set up a circuit like the one below and I will put a power supply on 2 Volts so that the wire will remain cool and keep the test fair. I will range my measurements from 10cm to 100cm going up in lots of 10cm as this will give my a good indication of the resistance in a wire. I will not do it every 1cm or 5cm as the clips are 4mm wide so

Resistance in a wire- good essay

1276 words - 5 pages voltage on the surface of a conductor. Current is measured in amps or amperes. Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. Resistance is measured in ohms ( ).HypothesisI think that the longer the wire is, the higher the resistance. This is because the current will have to travel a longer distance

Physic Sc1 Resistance Of A Wire

1468 words - 6 pages crocodile clip which I will clip onto the resistance wire at 10 cm intervals, measured along the ruler.Physics Coursework Friday, 09 March 2001 Alex Hall (J) How the resistance of a wire changes with different lengths Obtaining Evidence In order to gain a good range of results, I decided to repeat the experiment three times and take an average. I have plotted the average resistance results against the different lengths. In order to make the graph

Resistance of a Wire

1564 words - 6 pages GCSE Physics Coursework - Resistance of a Wire Coursework Resistance of a Wire Task To investigate how the resistance of a wire is affected by the length of the wire. Theory What is resistance? 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. it has less resistance. For example

To investigate the factors of affecting the resistance of a wire

2050 words - 8 pages Physics Coursework- Ohm's LawAim: To investigate the factors of affecting the resistance of a wire.In this experiment I will be using a metal nichrome wire to show the resistance when the length and width is changed.VariablesVariables that I am going to keep the same. Variables that I am going to change.Width- 0.36mm2Material- Nichrome wireVoltage- 2VTemperature- Room TemperatureLength- 10cm, 20 cm, 30cm, 40cm, 50cmMaterial- NichromeLength

Investigation into resistance of a wire (contains spaces for diagrams)

5746 words - 23 pages CourseworkAn Investigation Into The Resistance of different lengths of wireIntro In my coursework I intend to determine the relationship between resistance of a circuit and the length of a piece of wire.PlanningPlanning 1: Preliminary Work:I performed preliminary work to evaluate what voltage I was going to use for my proper experiment. The apparatus I will use for the preliminary is the same as I intend to use for my experiment, that is

Will the length of wire affect the resistance?

833 words - 3 pages PHYSICS PRACTICAL ASSESSMENTPLANA variable is something that can be changed or measured. The following is a list of variables that can be changed in the experiment that I will be doing:·Changing the length of the wire·Increasing the cross-section of the wire·Changing the material used·Changing the temperature·Changing the resistance of the wire·Changing the voltage going across the wire·Changing

Plan for Science Course Work The Resistance of Lengths of Wire

1638 words - 7 pages the conductor. The resistance of a conductor, or circuit element, generally increases with increasing temperature. When cooled to extremely low temperatures, some conductors have zero resistance.The Greeks discovered electricity over 2000 years ago, and electrons were discovered by J.J Thompson in 1844.Method:I will test different lengths of wire by inserting it into the circuit shown below and record the readings of the ammeter in a table. I

IB Physics - Electricity Cables (Online) Lab

2163 words - 9 pages Untitled IB Physics HL Lab exploring Electricity Pylon Cables Julia Wuestefeld DESIGN Summary This investigation was carried on with a simulator called Yenka; it will explore the relationship between different lengths of cables (aluminium and copper) and their respective resistance. Through the use of interactive features, the simulator allows for the investigation of what the total resistance of a cable is depending on its

Similar Essays

Physics Coursework Resistance Of A Wire

1250 words - 5 pages GCSE Physics Coursework - Resistance of a WireAim: To investigate how the resistance of a wire is affected by the length of the wire.What is resistance?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. it has less resistance. For example, gold has more free electrons than iron and, as a result, it

Gcse Physics Coursework Resistance Of A Wire Coursework Resistance Of A Wire

1551 words - 6 pages GCSE Physics Coursework - Resistance of a Wire CourseworkResistance of a WireTaskTo investigate how the resistance of a wire is affected by the length of the wire.TheoryWhat is resistance?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. it has less resistance. For example, gold has more free

Physics Investigating Resistance In A Wire

605 words - 2 pages Investigating Resistance in a WireThe resistance is the name given to the tendency for a wire to oppose the movement of the electrons passing through it. The greater the resistance the electrons occur the more voltage is needed to propel the current through the wire. Resistance is defined by the following equation:Resistance R= p.d across the wire (V) Current through the wire (I) Key FactorsThere are many factors to be

Physics (Resistance Of A Wire) Plan

980 words - 4 pages What affects the resistance of a wire Planning for the SC1 Introduction: In this experiment I will be investigating how length affects the resistance of a wire. This means I will be taking readings from an ammeter and also a voltmeter at different lengths of a wire. It will be powered by a power pack in which I will change the voltage to get different results.Aim: The aim of this experiment is to find out what affects the resistance of a wire