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VOLTAGE

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VOLTAGE What is voltage? Voltage  is the pressure from an electrical circuit’s power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light. In brief,  voltage = pressure , and it is measured in  volts  (V). The term recognizes Italian physicist Alessandro Volta (1745-1827), inventor of the voltaic pile—the forerunner of today’s household battery. In electricity’s early days, voltage was known as  electromotive force  (emf). This is why in equations such as Ohm’s Law, voltage is represented by the symbol  E . Example of voltage in a simple direct current (dc) circuit: In this dc circuit, the switch is closed (turned ON). Voltage in the power source—the “potential difference” between the battery’s two poles—is activated, creating pressure that forces electrons to flow as current out the battery’s negative terminal. Current reaches the light, causing it to glow. Current returns to the pow
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HISTORY OF THE LIGHT BULB

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History of the Light Bulb A Brief History of the Light Bulb The electric light, one of the everyday conveniences that most affects our lives, was not “invented” in the traditional sense in 1879 by Thomas Alva Edison, although he could be said to have created the first commercially practical incandescent light. He was neither the first nor the only person trying to invent an incandescent light bulb. In fact, some historians claim there were over 20 inventors of incandescent lamps prior to Edison’s version. However, Edison is often credited with the invention because his version was able to outstrip the earlier versions because of a combination of three factors: an effective incandescent material, a higher vacuum than others were able to achieve and a high resistance that made power distribution from a centralized source economically viable. Early Light Bulbs In 1802, Humphry Davy invented the first electric light. He experimented with electricity and invented an electric batt
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HISTORY OF ELECTRICITY

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HISTORY OF ELECTRICITY OBJECTIVES: Investigating the historical development of electricity. Exploring early investigators of electricity. VOCABULARY: electricity magnetism ACKGROUND: It was difficult for early people to distinguish between electricity and magnetism.  People experienced magnetism and static electricity since civilization began.  Both phenomena "attract" other substances.  Cloth when rubbed on certain substances could attract small items like a feather.  Lodestone could attract small pieces of metal.   Today, without electricity, our society would be a very different one. Humans have learned to control the electron to create wild and wonderful displays. Students can hardly  imagine life without electricity.  There would be no elevators, toasters, or video games. Computers, light bulbs, television, and radio would only be in the minds of dreamers. We are a world dependant on the electrons. Rumor has it that Hoang-Ti, the founde
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ELECTRIC BASICS

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There are three primary electrical parameters: the volt, the ampere and the ohm. The Volt. The pressure that is put on free electrons that causes them to flow is known as electromotive force (EMF). ... The Ampere. The ampere defines the flow rate of electric current. ... The Ohm. The ohm is the unit of resistance in a conductor. n order to understand even the simplest concepts of electronics, you must first understand what electricity is. After all, the whole purpose of electronics is to get electricity to do useful and interesting things. The concept of electricity is both familiar and mysterious. We all know what electricity is, or at least have a rough idea, based on practical experience. In particular, consider these points: We are very familiar with the electricity that flows through wires. That electricity comes from power plants that burn coal, catch the wind, or harness nuclear reactions. It travels from the power plants to ou
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ELECTRICITY GENERATION

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Electricity generation Electricity generation  is the process of generating  electric power  from sources of  primary energy . For  electric utilities , it is the first process in the delivery of electricity to consumers. The other processes as  transmission ,  distribution ,  energy storage and recovery using  pumped-storage  methods are normally carried out by the  electric power industry . Electricity is most often generated at a  power station  by  electromechanical   generators , primarily driven by  heat engines  fuelled by  combustion  or nuclear fission  but also by other means such as the  kinetic energy  of flowing water and wind. Other energy sources include solar  photovoltaics  and  geothermal power . The fundamental principles of electricity generation were discovered during the 1820s and early 1830s by the British scientist  Michael Faraday . This method is still used today: electricity is generated by the movement of a loop of wire, or  disc of copper  bet
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TYPES OF ELECTRICITY

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TYPES OF ELECTRICITY                                here are two types of Electricity, Static Electricity and Current Electricity. Static Electricity is made by rubbing together two or more objects and making friction while Current electricity is the flow of electric charge across an electrical field. Static Electricity Static electricity is when electrical charges build up on the surface of a material. It is usually caused by rubbing materials together. The result of a build-up of static electricity is that objects may be attracted to each other or may even cause a spark to jump from one to the other. For Example rub a baloon on a wool and hold it up to the wall. Before rubbing, like all materials, the balloons and the wool sweater have a neutral charge. This is because they each have an equal number of positively charged subatomic particles (protons) and negatively charged subatomic particles (electrons). When you rub the balloon with the wool sweater, electrons are t
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PRODUCTION OF ELECTRICITY

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PRODUCTION OF ELECTRICITY            Electricity is the set of physical phenomena associated with the presence of electric charge. Although initially considered a phenomenon separate to magnetism, since the development of Maxwell's Equations both are recognized as part of a single phenomenon: electromagnetism. Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others. In addition, electricity is at the heart of many modern technologies.                             
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