basic electricity chapter 1 atomic structure. terms to know w alternating current(ac) w atom w...
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BASIC ELECTRICITY
CHAPTER 1
ATOMIC STRUCTURE
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TERMS TO KNOW
ALTERNATING CURRENT(AC)
ATOM ATTRACTION CENTRIFUGAL FORCE CONDUCTORS DIRECT CURRENT (DC) ELECTRON ELECTRON ORBITS
INSULATORS MATTER NEGATIVE NEUTRON NUCLEUS POSITIVE PROTON SEMICONDUCTORS VALENCE ELECTRONS
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HISTORY OF ELECTRICITY GREEKS DISCOVERED 2500 YEARS AGO USED PRACTICALLY ABOUT 100 YEARS AMBER BECAME CHARGED WHEN
RUBBED WITH OTHER MATERIALS: ATTRACTED THINGS LIKE LEAVES, FEATHERS, BITS OF CLOTH
THE WORD ELECTRIC COMES FROM THE WORD “ELEKTRON”
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LIST A: POSITIVE
LIST B: NEGATIVE
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STUDY OF ATOMS ATOM IS THE BUILDING BLOCK OF
UNIVERSE ALL MATTER IS MADE FROM A
COMBINATION OF ATOMS MATTER IS ANY SUBSTANCE THAT HAS
MASS AND TAKES UP SPACE MATTER CAN EXIST IN THREE FORMS:
SOLID, LIQUID, OR GAS ELEMENT: CAN’T BE DIVIDED INTO A
SIMPLER SUBSTANCE
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STUDY OF ATOMS
THREE STATES OF WATER
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THREE PARTS OF AN ATOM: 1.ELECTRON
2. PROTON 3.NEUTRON
NUCLEUS: PROTON AND NEUTRON
NOTICE THE CHARGES OF EACH PART
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PROTON=POSITIVE CHARGE
ELECTRON=NEGATIVE
CHARGE
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LAW OF CHARGES….
Opposite charges attract and like charges repel
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VALENCE ELECTRONS
OUTER SHELL OF ATOM IS KNOWN AS “VALENCE SHELL”
ELECTRONS LOCATED IN OUTER SHELL ARE “VALENCE ELECTRONS”
THE VALENCE SHELL CAN’T HOLD MORE THAN 8 ELECTRONS
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COPPER: GOOD CONDUCTOR BECAUSE OF ONLY ONE VALENCE ELECTRON
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CURRENT FLOW HAPPENS WHEN ELECTRONS MOVE FROM
ATOM TO ATOM.
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INSULATORS: HAVE 7 OR 8 ELECTRONS IN VALENCE SHELL
SEMICONDUCTORS: HAVE 4 ELECRONS IN VALENCE SHELL
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CONDUCTORS
THEY HAVE ONLY 1 OR 2 VALENCE ELECTRONS:
THEY GIVE UP THOSE ELECTRONS EASILY WITH LITTLE EFFORT
THEY ALLOW CURRENT FLOW EASILY: LOW RESISTANCE!!!!!!
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EXAMPLES OF GOODCONDUCTORS SILVER: 1 VALENCE ELECTRON COPPER: 1 VALENCE ELECTRON GOLD: 1 VALENCE ELECTRON ALUMINUM: 3 VALENCE ELECTRON PLATINUM: 1 VALENCE ELECTRON
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INSULATORS
MATERIALS THAT HAVE 7 OR 8 VALENCE ELECTRONS
RESIST FLOW OF ELECTRICITY ELECTRONS ARE HELD TIGHTLY
AND ARE NOT GIVEN UP EASILY
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EXAMPLES OF INSULATORS
RUBBER PLASTIC GLASS WOOD
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SEMICONDUCTORS
MATERIALS THAT HAVE 4 VALENCE ELECTRONS
ARE NEITHER GOOD FOR CONDUCTORS OR INSULATORS
USED TO MAKE DIODES AND TRANSISTORS
COMPUTORSCOMPUTORS ARE FULL OF SEMICONDUCTOR MATERIAL
SILICON AND GERMANIUM MOST COMMON USED
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METHODS OF PRODUCINGELECTRICITY
MAGNETISM=GENERATOR CHEMICAL=BATTERY PRESSURE=PIEZO SENSORS HEAT=THERMOCOUPLES FRICTION=STATIC LIGHT=PHOTO ELECTRIC
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REVIEW…..
OPEN THE BOOKS TO SUMMARY AT END OF CHAPTER.
DO THE REVIEW QUESTIONS IN CLASS.