Physics Preliminary 8.2 The World Communicates 1. The wave model can be used to explain how current technologies transfer information 1. Describe the energy transformations required in one of the following: – Mobile telephone – Fax/modem – Radio and television A. An energy transformation is a change in the type of energy‚ for example a change from sound energy to electromagnetic waves. Relating this to the mobile telephone‚ it undergoes basic energy transformations of‚ sound wave
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Background of the Study Electricity plays very important role in the lives of people to make their work become easier and faster. It also provides productivity to our community. Industries use it to run motors efficiently. Several years ago‚ REINA which composed of 3 municipalities is simply a single town‚ which is Infanta. There was no supply of electric current in the town. Some public and private sector uses generator and some devices that generate electricity for the operation of different
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LIGHT DEPENDENT RESISTANCE INTRODUCTION In the society‚ some times street lights glow in day time due to any reason. In mines area people face many difficulties due to absence of light in the nights. In frontier and hilly areas‚ people face many problems due to damaged street lights. For solve above these problems‚ we create a device in which the lights glow in night and in day time‚ they off automatically and don’t glow. Due to use of it‚ we can solve above problems and can also save electricity
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CHAPTER 1 Capacitor & Dielectric Miss Nor Amalina Ahmad 2012 1.1 1.2 1.3 1.4 1.5 Capacitance Capacitor in series & parallel Energy stored in a charged capacitor Charging & discharging of capacitors Capacitors with dielectric Miss Nor Amalina Ahmad 2012 1.1 Capacitance Learning Outcomes : At the end of this topic‚ students should be able to: Define capacitance Use the capacitance formula Determine capacitance of parallel plate Miss Nor Amalina Ahmad 2012 A capacitor
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INTRODUCTION Surface modification is a miraculous application of Electric Discharge Machining (EDM). It can modify the conductive material surface by both removing material from the surface and depositing material on the surface. It can remove or deposit material from the work surface through controlled electrical sparks by the process of melting and evaporation. The controlled sparks erode material from the work and tool surface within very short intervals of time. Study of surface morphology widens
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a changing electric current is surrounded by an associated changing magnetic field‚ which in turn generates a changing electrical current in a conductor placed within it‚ which has its own magnetic field…and so on. It is the electromagnetic equivalent of nesting Matryoshka dolls. Thus‚ in the case of electromagnetic induction‚ placing a conductor in the magnetic field surrounding the first current generates the second current. Electromagnetic induction was discovered independently by Michael Faraday
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D.C. Generators Introduction Although a far greater percentage of the electrical machines in service are a.c. Machines‚ the D.C. machines are of considerable industrial importance. The principal advantage of the D.C. machine‚ particularly the D.C. motor‚ is that it provides a fine control of speed. Such an advantage is not claimed by any a.c. motor. However‚ D.C. generators are not as common as they used to be‚ because direct current‚ when required‚ is mainly obtained from an a.c. supply by the
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Common uses of magnets Hard disks record data on a thin magnetic coating. • Magnetic recording media: VHS tapes contain a reel of magnetic tape. The information that makes up the video and sound is encoded on the magnetic coating on the tape. Common audio cassettes also rely on magnetic tape. Similarly‚ in computers‚ floppy disks and hard disks record data on a thin magnetic coating. • Credit‚ debit‚ and ATM cards: All of these cards have a magnetic strip on one side. This strip encodes
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Living Science (Second Edition) Unit Test 2 8ʳ Making use of electricity S2 Science Test Unit 8ġ Making use of electricity Name:____________________________ ΰʳ ʳ ʳ α Time and Marks Class: ____________________________ Part A: 35 min / 100 marks Date: ____________________________ Parts A & B: 45 min / 120 marks Note: ʳ 1 Attempt ALL questions. 2 Write your answers in the spaces provided on the Answer Sheets. ʳ Part A (Level 1) A True or false questions (5 marks‚ 1 mark each) Study
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Lab Electric Fields Introduction: This experiment was to investigate the concept of the electric field‚ and to determine the shape of equal potential lines surrounding charged objects. 1. Procedures: Place the sheet of graph paper on a table and center the clear dish over the grid. 2. Prepare the conductors by first making 2 longer jumper cables from 4 short ones. Do this by simply opening the
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