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Published byDwain James Modified over 9 years ago
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ELECTRICAL ENGINEERING
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1729 ELECTRICAL CONDUCTORS AND INSULATORS DISCOVERED
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1745 DEVELOPMENT OF 1 ST ELECTRICAL CAPACITOR
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1837 THE FIRST ELECTRIC TELEGRAPH
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1861 THE ELECTRIC OVEN INVENTED WOOD COMBINATION ELECTRIC
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1874 ELECTRIC LIGHT BULB INVENTED
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1887 1 ST ALTERNATING CURRENT NETWORK
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1904 INVENTION OF THE DIODE
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1929 1 ST COHERENT THEORY ON SEMICONDUCTORS
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1943 FIRST PROGRAMMABLE ELECTRONIC COMPUTER
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1947 TRANSISTOR INVENTED
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1971 1 ST MICROPROCESSOR AND FIRST MICROCOMPUTER
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The first computer my brother owned
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1979 HANDHELD VIDEO GAMES AND CELL PHONES INVENTED
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Electronic Quarterback was banned from my high school
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Pong console
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Show Pong Bookmarked
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Atari 2600 Console
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Show asteroids Bookmarked
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1999 FIRST HARD-DRIVE MP3 PLAYER
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ELECTRICAL ENGINEERING
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ELECTRICAL ENGINEERING RELATES BOTH ELECTRICITY AND ELECTRONICS
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ELECTRONIC VS ELECTRICAL ELECTRONIC MADE WITH SEMICONDUCTOR MATERIAL USUALLY SILICON EXAMPLES-DIODES, TRANSISTORS, RECTIFIERS, SUPRESSORS ELECTRICAL MADE WITH CONDUCTOR MATERIAL METALS AND ALLOYS EXAMPLES- WIRES, SWITCHES, FUSES
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ALLOY A homogeneous mixture made by fusing two or more metals, or a metal and a nonmetal To obtain desirable qualities such as hardness, lightness, and strength Brass is a mixture of zinc and copper
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ELECTRICAL CIRCUITS ELECTRON FLOW OCCURS FROM THE NEGATIVE TERMINAL (WHERE THERE IS AN EXCESS OF NEGATIVE ELECTRONS) TO THE POSITIVE TERMINAL (WHERE THERE IS A LACK OF ELECTRONS) CONVENTIONAL CURRENT FLOWS FROM POSITIVE TERMINAL TO NEGATIVE TERMINAL
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SYMBOLS FOR CIRCUIT DIAGRAMS BATTERY AC POWER SUPPLY
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DIODE LED
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TRANSISTOR SWITCH
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RESISTOR OTHER SYMBOLS PAGE 460 OBSERVATORY
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DIRECT CURRENT UNIDIRECTIONAL FLOW OF ELECTRIC CHARGE ELECTRONS MOVE CONTINUOUSLY IN THE SAME DIRECTION
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ALTERNATING CURRENT ELECTRONS MOVE BACK AND FORTH IN A REGULAR PATTERN VIBRATING MOTION OF ELECTRONS ALLOW CURRENT TO FLOW
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POWER SUPPLY PROVIDES THE ENERGY THAT CAUSES THE CURRENT TO FLOW THROUGH THE CIRCUIT
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DISCUSS THE ADVANTAGES AND DISADVANTAGES OF EACH OF THE THREE POWER SUPPLIES
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CONDUCTION, INSULATION AND PROTECTION
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CONDUCTION Energy (eg. Electrical) transfer from one material to another by direct contact. Conductors are materials that allow transfer to happen. Examples of good conductors are copper, aluminum, silver and optical fibres.
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Transition metals are good conductors of electricity and heat.
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PRINTED CIRCUITS( EST/AST ONLY ) ELECTRICAL CIRCUIT PRINTED ON A THIN RIGID BOARD
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ONE METHOD HAS BOARDS COVERED WITH COPPER, THE CIRCUIT IS THEN ETCHED INTO THE COPPER AND THEN THE REST OF THE COPPER IS DISSOLVED AWAY LEAVING JUST THE CIRCUIT; ELECTRIC AND ELECTRONIC COMPONENTS ARE THEN SOLDERED INTO HOLES DRILLED INTO THE BOARDS
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MASS MANUFACTURING OF CIRCUIT BOARDS VIDEO http://video.google.ca/videosearch?sourceid= navclient&rlz=1T4ADBS_enCA314CA314&q =printed%20circuits&um=1&hl=en&ie=UTF- 8&sa=N&tab=iv&start=0#q=HOW+STUFF+W ORKS+printed+circuits&hl=en&emb=0
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INSULATION THE ELECTRICAL FUNCTION PERFORMED BY A COMPONENT TO PREVENT THE FLOW OF AN ELECTRIC CURRENT PREVENT INJURY AS WELL AS SHORT CIRCUITS CERAMIC AND PLASTIC ARE GOOD INSULATORS
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PROTECTION FUSES AND CIRCUIT BREAKERS ARE EXAMPLES OF PROTECTION PROTECTION IS A COMPONENT THAT STOPS THE FLOW OF CURRENT IN THE EVENT OF A POWER SURGE
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ELECTRICAL RESISTANCE ( EST/AST ONLY ) RESISTORS LIMIT THE FLOW OF ELECTRONS THROUGH AN ELECTRICAL CIRCUIT
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RESISTANCE IS MEASUREDC IN OHMS
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READING A RESISTOR ON 4 BANDS RESISTORS- THE 1 ST TWO BANDS TELL YOU THE FIRST TWO DIGITS OF RESISTANCE (ex. RED=2; BLUE=6) THE NEXT BAND TELLS YOU WHAT TO MULTIPLY THOSE NUMBERS BY (ex. RED=100) LAST BAND IS TOLERANCE FACTOR (EX. GOLD= ±5%) THEREFORE A RESISTOR WITH RED, BLUE, RED, GOLD WOULD HAVE RESISTANCE OF 2600 ohms ±5%
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CONTROL The function performed by a component that can open or close a circuit switches and pushbuttons are examples of controls
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SWITCHES ( EST/AST ONLY ) SINGLE POLE SWITCH OPENS/CLOSES 1 CONTACT AT A TIME DOUBLE POLE CAN OPEN/CLOSE TWO CONTACTS AT ONCE ELECTRONS FOLLOW 1 PATH IN SINGLE THROW SWITCH DOUBLE THROW ALLOWS ELECTRONS TO FOLLOW 1 OF 2 PATHS P470
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SWITCHES ( EST/AST ONLY ) ROCKER SWITCH
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TOGGLE SWITCH
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PUSH BUTTON
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MAGNETIC CONTACT
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ENERGY TRANSFORMATION( ST/EST/AST ONLY ) CHANGE OF ONE FORM OF ENERGY TO ANOTHER FORM OF ENERGY
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( ST/EST/AST ONLY ) EXAMPLES OF ELECTRICAL COMPONENTS USED TO TRANSFORM ELECTRICITY INCANDESCENT BULBS- NEW FORM- LUMINOUS ENERGY
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HEATING ELEMENT- NEW FORM- THERMAL ENERGY
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PIEZOELECTRIC CRYSTALS- NEW FORM – MECHANICAL OR SOUND ENERGY
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ELECTROMAGNETS – NEW FORM OF ENERGY – MAGNETIC ENERGY
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COMPONENTS WITH OTHER FUNCTIONS ( EST/AST ONLY ) CAPACITORS DIODES TRANSISTORS ( AST ONLY ) RELAYS ( AST ONLY )
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CAPACITORS CAN STORE ELECTRICAL CHARGE COMPOSED OF TWO ELECTRICAL SURFACES SEPARATED BY AN INSULATOR (BLOCKS THE FLOW OF ELECTRONS) CHARGE BUILDS UP ON ONE PLATE, INSULATOR IS REMOVED AND CHARGE IS RELEASED ALMOST INSTANTLY
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CAPACITOR CHARGE FROM CAMERA BATTERY BUILDS UP UNTIL BUTTON IS PRESSED FULL CHARGE IS RELEASED IN THE FLASH
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DIODE ALLOWS ELECTRIC CURRENT TO FLOW IN ONE DIRECTION MADE OF SEMICONDUCTOR PROTECTS ELECTRONIC PARTS FROM HAVING ELECTRONS FLOW IN THE WRONG DIRECTION
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DIODE USED TO CONVERT AC TO DC LED’S ARE ‘LIGHT EMITTING DIODES’ THAT GIVE OFF LIGHT WHEN CURRENT FLOWS THROUGH THEM
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TRANSISTORS ( AST ONLY ) BLOCK OR AMPLIFY AN ELECTRIC CURRENT
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TRANSISTORS ( AST ONLY ) CURRENT FLOWS FROM COLLECTOR TO EMITTER TO BASE BASE ACTS LIKE A VALVE THAT ALLOWS CURRENT TO FLOW FREELY; BLOCK FLOW OR ALLOW SOMEWHERE IN BETWEEN CONNECTION BETWEEN TRANSISTORS AND COMPUTERS P477 OF OBSERVATORY
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RELAYS ( AST ONLY ) A RELAY OPENS OR CLOSES A CIRCUIT USING AN ELECTRICAL SIGNAL FROM ANOTHER CIRCUIT (THINK RELAY RACE-PASSING ON)
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RELAYS ( AST ONLY ) COMMONLY USED TO CONTROL HIGH VOLTAGE CIRCUITS FROM A REMOTE DISTANCE LIGHTING IN A THEATRE, HIGH VOLTAGE APPLIANCES (X-RAY MACHINE)
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