electricity is the electric current resulting from the existence of charged particles such as electrons or protons. Electricity figures everywhere in our lives. Electricity lights up our homes‚ cooks our food‚ powers our computers‚ television sets‚ and other electronic devices. Electricity from batteries keeps our cars running and makes our flashlights shine in the dark. Here’s something you can do to see the importance of electricity. Take a walk through your school‚ house or apartment and write
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reaction of phenol with formaldehyde. It was developed by Belgian-born chemist Leo Baekeland in New York in 1907. One of the first plastics made from synthetic components‚ Bakelite was used for its electrical non-conductivity and heat-resistant properties in electrical insulators‚ radio and telephone casings‚ and such diverse products as kitchenware‚ jewelry‚ pipe stems‚ and children’s toys. HISTORY: HOW IT CAME INTO BEING. Dr. Baekeland had originally set out to find a replacement for shellac‚ made from the excretion
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1. Energy transfer by heating * Infrared Radiation * Surfaces and Radiation * States of matter * Conduction * Convection * Evaporation and condensation * Energy Transfer by design * Specific heat capacity * Heating and insulation buildings 2. Using Energy * Forms of energy * Conservation of energy * Useful energy * Energy and efficiency 3. Electrical Energy * Electrical Appliances * Electrical Power * Using electrical energy
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across the entire surface of the object. Metals like silver‚ gold and aluminium are good insulators as it ‘conducts’ the electron current or flow of electrons fairly easily. What is an insulator? Insulators have the opposite effect on the flow of electrons; they do not let electrons flow very easily from one atom to another. Insulators are materials whose atoms have tightly bound electrons. Some common insulators are glass‚ plastic‚ rubber‚ air and wood. What is voltage? Voltage is a specific measure
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Interfaces often contribute significantly to the observed properties of the materials. The inter-molecular transfer of energy could be primarily by elastic impact as in fluids or by free electron diffusion as in metals orphonon vibration as in insulators. In insulators the heat flux is carried almost entirely by phonon vibrations. Metals (e.g. copper‚ platinum‚ gold‚etc.) are usually good conductors of thermal energy. This is due to the way that metals are chemically bonded: metallic bonds (as opposed to covalent or ionic
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Semiconductor —I • Materials that permit flow of electrons are called conductors (e.g.‚ gold‚ silver‚ copper‚ etc.). • Materials that block flow of electrons are called insulators (e.g.‚ rubber‚ glass‚ Teflon‚ mica‚ etc.). • Materials whose conductivity falls between those of conductors and insulators are called semiconductors. • Semiconductors are “part-time” conductors whose conductivity can be controlled. germanium Semiconductors silicon Semiconductor —II
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Windows Low-E windows -clear coat of metallic oxide which keeps the heat inside the house in winter and outside the house in summer -they cost more than average windows but can lower you heating costs. -the metallic oxide reflects the suns radiant heat back off the windows so that in the summer your house keeps cool leaving you with a lower energy bill for not using your air conditioner a lot. Envirovision -high security -noise reduction -two glass windows 3cm apart from each other maximizes
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The Market Jacobs Industries’ only product is an industrial chemical that can be mixed with air to form a foam that is: • Lightweight; • Stable over a very wide range of temperatures; • A very efficient thermal insulator; • A very efficient acoustic insulator. Jacobs sells its chemical to manufacturers of air conditioner retrofit kits. The manufacturers are all located in the region of Calopeia. They purchase the foam chemical as a substitute for competitors’ products. If Jacobs cannot ship
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Anna Holster Introduction to the Sciences Wentzel Briar CTU Virtual Login Individual Project 1 01/14/13 The statement that; “Computers are part of our everyday lives.” Is so correct‚ I don’t think the people of today would know how to do anything without the computer. Between the desktop top computers and laptops to the smart phone everything can be stored using less space and the ability to locate stuff so much more easier that if the world of today lost computers around the world for even
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vacuum. In the electron microscope and the ion microscope‚ microdischarges due to applying high voltage to electrodes sometime occur‚ resulting in deterioration of image quality. Microdischarges are related with the gas molecules on the surfaces of insulators and electrodes. For many scientific instruments such as the electron microscope‚ a very clean‚ ultrahigh vacuum is necessary in the vicinity of the
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