ELECTRICAL ENGINEERING

1729 ELECTRICAL CONDUCTORS AND INSULATORS DISCOVERED

1745 DEVELOPMENT OF 1 ST ELECTRICAL CAPACITOR

1837 THE FIRST ELECTRIC TELEGRAPH

1861 THE ELECTRIC OVEN INVENTED WOOD COMBINATION ELECTRIC

1874 ELECTRIC LIGHT BULB INVENTED

ST ALTERNATING CURRENT NETWORK

1904 INVENTION OF THE DIODE

ST COHERENT THEORY ON SEMICONDUCTORS

1943 FIRST PROGRAMMABLE ELECTRONIC COMPUTER

1947 TRANSISTOR INVENTED

ST MICROPROCESSOR AND FIRST MICROCOMPUTER

The first computer my brother owned

1979 HANDHELD VIDEO GAMES AND CELL PHONES INVENTED

Electronic Quarterback was banned from my high school

Pong console

Show Pong Bookmarked

Atari 2600 Console

Show asteroids Bookmarked

1999 FIRST HARD-DRIVE MP3 PLAYER

ELECTRICAL ENGINEERING

ELECTRICAL ENGINEERING RELATES BOTH ELECTRICITY AND ELECTRONICS

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

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

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

SYMBOLS FOR CIRCUIT DIAGRAMS BATTERY AC POWER SUPPLY

DIODE LED

TRANSISTOR SWITCH

RESISTOR OTHER SYMBOLS PAGE 460 OBSERVATORY

DIRECT CURRENT UNIDIRECTIONAL FLOW OF ELECTRIC CHARGE ELECTRONS MOVE CONTINUOUSLY IN THE SAME DIRECTION

ALTERNATING CURRENT ELECTRONS MOVE BACK AND FORTH IN A REGULAR PATTERN VIBRATING MOTION OF ELECTRONS ALLOW CURRENT TO FLOW

POWER SUPPLY PROVIDES THE ENERGY THAT CAUSES THE CURRENT TO FLOW THROUGH THE CIRCUIT

DISCUSS THE ADVANTAGES AND DISADVANTAGES OF EACH OF THE THREE POWER SUPPLIES

CONDUCTION, INSULATION AND PROTECTION

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.

Transition metals are good conductors of electricity and heat.

PRINTED CIRCUITS( EST/AST ONLY ) ELECTRICAL CIRCUIT PRINTED ON A THIN RIGID BOARD

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

MASS MANUFACTURING OF CIRCUIT BOARDS VIDEO 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

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

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

ELECTRICAL RESISTANCE ( EST/AST ONLY ) RESISTORS LIMIT THE FLOW OF ELECTRONS THROUGH AN ELECTRICAL CIRCUIT

RESISTANCE IS MEASUREDC IN OHMS

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%

CONTROL The function performed by a component that can open or close a circuit switches and pushbuttons are examples of controls

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

SWITCHES ( EST/AST ONLY ) ROCKER SWITCH

TOGGLE SWITCH

PUSH BUTTON

MAGNETIC CONTACT

ENERGY TRANSFORMATION( ST/EST/AST ONLY ) CHANGE OF ONE FORM OF ENERGY TO ANOTHER FORM OF ENERGY

( ST/EST/AST ONLY ) EXAMPLES OF ELECTRICAL COMPONENTS USED TO TRANSFORM ELECTRICITY INCANDESCENT BULBS- NEW FORM- LUMINOUS ENERGY

HEATING ELEMENT- NEW FORM- THERMAL ENERGY

PIEZOELECTRIC CRYSTALS- NEW FORM – MECHANICAL OR SOUND ENERGY

ELECTROMAGNETS – NEW FORM OF ENERGY – MAGNETIC ENERGY

COMPONENTS WITH OTHER FUNCTIONS ( EST/AST ONLY ) CAPACITORS DIODES TRANSISTORS ( AST ONLY ) RELAYS ( AST ONLY )

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

CAPACITOR CHARGE FROM CAMERA BATTERY BUILDS UP UNTIL BUTTON IS PRESSED FULL CHARGE IS RELEASED IN THE FLASH

DIODE ALLOWS ELECTRIC CURRENT TO FLOW IN ONE DIRECTION MADE OF SEMICONDUCTOR PROTECTS ELECTRONIC PARTS FROM HAVING ELECTRONS FLOW IN THE WRONG DIRECTION

DIODE USED TO CONVERT AC TO DC LED’S ARE ‘LIGHT EMITTING DIODES’ THAT GIVE OFF LIGHT WHEN CURRENT FLOWS THROUGH THEM

TRANSISTORS ( AST ONLY ) BLOCK OR AMPLIFY AN ELECTRIC CURRENT

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

RELAYS ( AST ONLY ) A RELAY OPENS OR CLOSES A CIRCUIT USING AN ELECTRICAL SIGNAL FROM ANOTHER CIRCUIT (THINK RELAY RACE-PASSING ON)

RELAYS ( AST ONLY ) COMMONLY USED TO CONTROL HIGH VOLTAGE CIRCUITS FROM A REMOTE DISTANCE LIGHTING IN A THEATRE, HIGH VOLTAGE APPLIANCES (X-RAY MACHINE)