HISTORY OF ELECTRICITY Depite what you have learned‚ Benjamin Franklin did not "invent" electricity. In fact‚ electricity did not begin when Benjamin Franklin at when he flew his kite during a thunderstorm or when light bulbs were installed in houses all around the world. The truth is that electricity has always been around because it naturally exists in the world. Lightning‚ for instance‚ is simply a flow of electrons between the ground and the clouds. When you touch something and get a shock
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things of the past. We now light our lamps with electricity. Switch on the button and there is the day-like light even in the darkest night. In summer seasons electric fans‚ air conditioning plants are used to provide us with cool atmosphere. In winter‚ heating plants are used to keep the room warm. Electric bells‚ press and stove are things of every-day use. People keep refrigerators in their homes to keep their food in a fresh condition. Indeed electricity serves as a faithful domestic servant in daily
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off machines when you leave a room (examples include TV’s‚ computers‚ radios‚ stereos‚ video games‚ VCR’s‚ and DVD players). * When you go away on a trip‚ be sure to unplug these same machines because they have stand-by functions that consume electricity even when they are turned off. * Fill your dishwasher efficiently and limit the number of times you run it. * Don’t put furniture and other things in front of heating and air conditioning vents. * Keep doors and windows closed when heat
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What is Magnetism? Properties of Magnets: Magnet: any material that attracts iron and materials that contain iron Magnets attract iron and materials that contain iron. magnets attract or repel other magnets. In addition‚ one part of a magnet will always point north when allowed to swing freely. Magnetic Poles: Magnetic Pole: any magnet with 2 ends‚ each is called a magnetic pole. Magnetic poles that are unlike attract each other and magnetic poles that are alike repel each other. Magnetic
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Lecture Notes: Basic Electricity Fall 2011 This course module introduces the basic physical models by which we explain the flow of electricity. The Bohr model of an atom – a nucleus surrounded by shells of electrons traveling in discrete orbits – is presented. Electrical current is described as a flow of electrons. Ohm’s law – the relationship between voltage‚ current and electrical resistance – is introduced. Learning Objectives Understanding the basic principles of electricity is a foundational
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Electricity was first researched by Thales of Miletos around 600BC. He conducted a few experiments on static electricity in which he believed that friction made amber become magnetized. Other than the fact that people knew that eels produced electric shocks‚ electricity was little more than an intellectual curiosity for over 2000 years. Until 1600 when someone from England discovered the lodestone effect when amber with static would attract small objects towards it. In the 18th century‚ Benjamin
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CHAPTER - 12 ELECTRICITY HOTS Questions for Practice 1. Name a substance whose resistance almost remains unchanged by increase of temperature. 2. Name two special characteristics of heater coil. 3. A wire of resistance 4 ohms is bent to form a circle. What is the resistance between two diametrically opposite ends? 4. How does the resistance of a conductor change if its temperature is increased? 5. A current of 4A flows in a wire of resistance 60 ohms. Calculate electrical energy consumed in 2 minutes
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What do you think the world would be like without imagination? There would be no Iphone‚no car ‚no light bulb. The world would be useless to anything. The first humans would be eaten within a day. That is why I think imagination is important. If no one had imagined a machine that tells time the world would be a disaster zone. All presidential elections would be messed up. All peace meetings would be unorganized. No one would have a bed time. No school either. No wars would end. All because a clock
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asking the question “What would the world be without women?” In one particular advertisement we see a average man dressed in women’s clothing and holding a baby‚ with the question “What would the word be without women?” However the Australian clothing may have had the best intentions at heart to empower women and to challenge culture. This ad is asking questions about the role of women and the role of men; Are men co-dependent of women? Could the world survive without them? They may have very well
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Is a world without poverty and impossible dream? Although there is increasing attention and awareness of poverty‚ it remains as a major issue across the globe. This is due to the deeply entrenched causes‚ which cannot be simply eradicated and the ineffectiveness of international aid and efforts. Hence‚ I agree that a world without poverty is an impossible dream. Opponents of my claim would argue that a world without poverty is indeed possible and that it is only a matter of time‚ based on statistics
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