HS Physics on telecom

TELECOM SPEED OF E .M .WAVES 3x 3oo,ooo,ooo m/s 8m/s 10 TELECOM SPEED OF SOUND WAVES 340 m/s in air TELECOM EQUATIONS v= fl TELECOM = the number of waves per second Measured in Hertz (HZ) Frequency TELECOM WAVE –THIS TELLS YOU THE RADIO STATION AUDIO WAVE TELLS YOU WHAT IS ON THE STATION CARRIER TELECOM MODULATED (AM) WAVE –A COMBINATION OF THE CARRIER AND AUDIO WAVE AMPLITUDE TELECOM OF THE RADIO 1. AERIAL - PICKS UP ALL SIGNALS 2. TUNER – SELECTS ONE PARTICULAR SIGNAL PARTS TELECOM 3. DECODER – SEPARATES CARRIER WAVE FROM AUDIO WAVE 4. AMPLIFIER – MAKES BIGGER COPY OF AUDIO WAVE TELECOM 5. BATTERY – SUPPLIES ENERGY TO AMPLIFIER 6. LOUDSPEAKER – CHANGES ELECTRICAL ENERGY TO SOUND ENERGY TELECOM MIXING 3 PRIMARY COLOURS – RED , GREEN , BLUE TOGETHER MAKE WHITE COLOUR TELECOM AND GREEN GIVE YELLOW. RED AND BLUE GIVE MAGENTA GREEN AND BLUE GIVE CYAN RED TELECOM SATELLITES ARE AT A HEIGHT OF 36 , 000Km ABOVE THE EARTH THEY HAVE A 24 HR ORBIT GEOSTATIONARY TELECOM SIGNALS ARE MICROWAVE AND TRAVEL IN A STRAIGHT LINE TO AND FROM THE SATELLITE.THEY CANNOT CURVE IN THE EARTH`S ATMOSPHERE TELECOM OPTICAL FIBRES USED TO CARRY INFORMATION BY TOTAL INTERNAL REFLECTION. LIGHT TRAVELS AT A SPEED OF 200 , 000 , 000 M/S ELECTRICITY  EQUATIONS  Q=IxT V=IxR P=IxV P=E/t  P = V2 / R P = I2R  RT = R 1 + R 2  1 /RT = 1/R1 + 1/R2 ELECTRICITY RULES FOR SERIES AND PARALLEL CIRCUITS  VOLTAGE SPLITS UP IN A SERIES CIRCUIT  CURRENT STAYS THE SAME IN A SERIES CIRCUIT  VOLTAGE STAYS THE SAME IN A PARALLEL CIRCUIT  CURRENT SPLITS UP IN A PARALLEL CIRCUIT  ELECTRICITY VOLTMETERS MEASURE VOLTAGE AND GO ACROSS THE COMPONENT  AMMETERS MEASURE CURRENT AND ARE WIRED IN SERIES WITH THE COMPONENTS.  CIRCUIT COMPONENTS INCLUDE RESISTORS , BULBS ETC.  ELECTRICITY MAINS ELECTRICITY  WIRES IN THREE PIN PLUG  1. BROWN LIVE 2. BLUE NEUTRAL  3. GREEN / YELLOW EARTH  FUSE IS A SAFETY DEVICE WIRED IN THE  LIVE PIN  EARTH WIRE NOT NEEDED FOR DOUBLE INSULATED APPLIANCES , THEY HAVE A PLASTIC CASING  ELECTRICITY MAINS ELECTRICITY  THREE TYPES OF CIRCUIT  1. THE LIGHTING CIRCUIT 15A FUSE 2. THE RING MAINS CIRCUIT 30A FUSE 3. THE COOKER CIRCUIT 45A FUSE  ALL ARE WIRED IN PARALLEL IF ONE GOES OUT THE OTHERS STAY ON LESS WIRE USED SO MONEY IS SAVED  ELECTRICITY ELECTRIC MOTORS  COIL OF WIRE CARRYING CURRENT SURROUNDED BY A PAIR OF MAGNETS  THE MORE TURNS ON THE COIL AND THE STRONGER THE MAGNET , THE FASTER THE COIL GOES.  ELECTRICITY  TWO COILS OF WIRE WITH AN IRON CORE , THE PRIMARY COIL AND THE SECONDARY COIL  TRANSFORMERS  NP /NS = VP / VS  IP x VP = I S x VS HEALTH TYPES OF THERMOMETER  1. THE LAB THERMOMETER 2. THE CLINICAL THERMOMETER BOTH LIQUID IN GLASS THERMOMETERS 3. THE DIGITAL THERMOMETER  DIFFERENCE BETWEEN LAB AND CLINICAL THERMOMETERS, SIZE,SCALE, MAGNIFIER IN CLINICAL THERMOMETER,KINK 