AP1200_Ch5_Electricity-1ChargeForceField-2008

AP1200_Ch5_Electricity-1ChargeForceField-2008 - Electricity...

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Electricity Lecture 1
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2 Learning Objectives You should become able to: describe the properties of electric charge,  relate electrical current, potential, resistance  and power 8
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3 Reading and Research Reading and Research Consult our lecture notes, and the recommended textbooks You will find many learning tools, including Java applets  (interactive on-line demonstrations), at: http://www.merlot.org/  at top right, enter search keywords (e.g. optics) http://hyperphysics.phy- astr.gsu.edu/hbase/electric/ecircon.html#c1 contains many useful explanations and illustrations  about electricity Youtube.com 7
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4 Warning:   Warning:  Copyright Most of the images shown here were  downloaded from the web, without asking  owners/authors: The owners/authors included no ban on use Copyright must still be respected: The images can be used for educational purposes  only; we/you may not make money with them 8
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5 Electrical Energy Our modern world revolves around the need for  electric energy: Watch TV Use mobile phone/computer Switch on the lights/air conditioning Take MTR. .. Can you imagine modern life without  electricity? 6
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6 Uses of Electricity: Lighting electric street lighting 19 th century laser show first electric light bulb - Edison 9
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7 Use of Electricity: Mechanical  Power Shanghai Maglev electric motor - C.G. Page 1850s 8
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8 Uses of Electricity: Refrigeration,  Heating electric refrigerator underfloor heating 5
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9 Uses of Electricity:  Telecommunications telegraph telephone internet 6
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10 radiotelephone radio/television 7 Uses of Electricity: Electronics
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11 Uses of Electricity: Computers Earth Simulator (5120 processors) ~ 2004 ENIAC computer ~1946 A Boeing 777 airplane contains ~ 1000 computers 8
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12 Nature of Electricity Early observation of electricity a. When amber (fossilized resin from  trees) is rubbed with a cloth, it can  attract nearby bits of straw or grain. b. A light-releasing phenomenon  caused by charged solar particles  following the earth’s magnetic lines of  force a. Amber 6 b. Aurora 
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13 Nature of Electricity What is electricity? Electricity is the  flow and  accumulation of  electric charges: electrons, protons  and any “carriers”  of charge (e.g. ions  in lightning and  batteries) lightning 9
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14 Convenience of Electricity Why is electricity so useful? Compare with using water in  pipes for the same purposes e.g. microfluidics Electricity acts extremely fast: signals in metals travel at  ~2/3 speed of light in  vacuum Electrical conductors are easy  to find and shape metals (semiconductors are  less easy to make) 8
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15 Inconvenience of Electricity Drawbacks of electricity:
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AP1200_Ch5_Electricity-1ChargeForceField-2008 - Electricity...

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