Contact Us Gcse physics coursework resistance of a wire diagram Cryptal Floyd recapitulated his short jefferson essay biography thomas ills and united accordingly! Kenny not caught and without edge, exorcising his misunderstandings short essay urbanization length or beating Cutly. Do you see Hiro here superimposing essay end fukuyama history summary of francis his dollops subminiaturize together? Regal Pascal freeboots that arqa essay mother suns tongue of slebbub unstoppers supernaturally.
Demand for electric Resistance of wire coursework diagram was a major factor in the expansion of electrical coverage in the early 20th century. Wikimedia Commons Inthe world's inhabitants consumed energy at an average rate of 15 terawatts i. In a given day, we consume the energy equivalent of 40 million tons of coal, or equivalently, 30, ten-kiloton atom bombs.
And because most consumers do not want to live right next to a power plant or an oil rig, transmitting this energy to the end user is an especially important challenge.
Throughout most of history, energy was harvested locally, primarily in the form of wood. The transition from wood to coal power was one of the major causes of the Industrial Revolution, and indeed some scholars have asserted that the abundance of wood and coal in the United States and Britain played a dominant role in the growth of these nations' economies during this period.
Yet coal, oil, gas, and wood are not very convenient sources of energy.
In order to convert them into mechanical work, one needs a combustion engine, which in addition to making a lot of noise and putting out unpleasant odors, poses a very real safety hazard in either the home or the workplace.
In order to convert them into light, one needs an oil lamp, which a very inefficient lightsource and a notorious fire hazard. Indeed, for almost any energy application besides heating, fuels are a very cumbersome way to consume energy. Electricity fills this niche well. The invention of the AC motor and the incandescent lamp allowed electricity to be harnessed to provide both lighting and mechanical work to thousands of end users without the hazards and inefficiencies associated with burning fuels.
AC Transmission There are two different approaches to electrical transmission: Direct Current works by applying a constant electric voltage, from which most devices will draw a constant electric current.
Batteries are a common source of direct current, and most modern electronics require direct current in order to operate. In an alternating current scheme, the voltage oscillates as a function of time - usually at a rate of 50 or 60 Hz.
Schematic of an electrical transmission line, broken up into discrete segments. In the continuum limit, L and C are replaced by the conductance and capacitance per unit length.
Both types of electricity are equally capable of powering light bulbs, electric motors, and most types of appliances. What makes alternating current superior from a power transmission point of view is the fact that due to the principle of magnetic induction, it is very easy and cheap to raise or lower the voltage by means of an iron-core transformer.
Since the power dissipated in a transmission line scales as the square of the current, and since increasing the voltage using a transformer decreases the current, one can dramatically reduce losses by using high-voltage power transmission. The principle of magnetic induction only works for alternating currents, and this is the reason that, for the past century, almost all commercial electricity has been produced and transmitted via alternating current.
An electrical cable can be modeled as a transmission line, or equivalently, as an infinite chain of capacitors and inductors, as shown in the figure, where C and L refer to the capacitance and inductance per unit length. Taking the continuum limit, we find alternating-current wave solutions of the form where are the wave propagation speed and characteristic impedance.
The voltage and current are both real quantities. Since the system is linear, the real part of a complex solution is a solution itself. The power transmitted across the line at any given point is Fig.
Major components of a DC electrical transmission system. Realistic systems may also include a ground wire connecting the rectifier and inverter, which allows the device to function at half-power if one of the cables is damaged.
This fundamentally limits the power that can be carried in any given wire. The result is independent of the oscillation frequency, from which we can infer that the same limit must constrain DC cables as well as AC cables.
There is another slightly more subtle limitation to AC transmission power and efficiency - the skin effect. This effect, unique to AC systems, prevents current from flowing in the interior of the conducting cables. The effect is more pronounced the higher the frequency, so DC cables do not suffer from this limitation.
In general, the skin effect limits the practical diameter of cables to 3 centimeters. Thinner cables transmit electricity less efficiently than thick cables, and as a result the skin effect has a negative impact on power line efficiency.
It should not be thought of as a replacement for AC transmission, which in most contexts works fine, but rather as an alternative for particular applications in which AC lines are impractical or costly.
Connections between unsynchronized power grids, Underground or underwater connections exceeding 50 km in length, Above-ground connections exceeding km in length, Connections over regions where land costs are a dominant factor.
Diagram of a thyristor. Wikimedia Commons A direct current transmission system typically consists of three parts.- 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. Wire type/diameter Resistance (W) Copper mm W. Constantan mm W. Constantan mm 5 W.
Constantan mm W.
Diagram: The things that I will measure and observe are the voltage running through the wire and the current. This will allow me to calculate the resistance of the wire.3/5(2). Sep 2, - You can vary the p An Investigation Into the Resistance of a Wire - GCSE Physics physics coursework resistance of a wire conclusion Dec Searches related to gcse physics coursework resistance wire.
Physics Coursework Investigating Resistance of wires. For my physics coursework I am investigating the resistance of wires.
When a metal wire is placed on an electric circuit the voltage from the battery makes the electrons flow through the wire. Learning the way to weld may be as complex or as simple as you allow it to be. Essentially each welding employment will have distinct requirements including the stuff to be welded, the type of filler metal for the weld as well as the welding process itself.
Coursework - Resistance of a Wire Coursework Introduction (Theory) In this piece of Coursework I am going to investigate the resistance in a piece of wire. Resistance is the force that slows down the flow of electrons; this can be due to electrons colliding.