Understanding Electricity and Telecommunication Systems
Explore the basic concepts of electricity including mains supply, fuses, power measurements, plug wire colors, and safety precautions. Delve into the components of radios and telecom systems such as aerials, tuners, decoders, amplifiers, batteries, and color mixing. Learn about geostationary satellites, signal transmission, and color generation in telecommunication. Gain insights into how electricity and telecom technologies work and their importance in our daily lives.
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Presentation Transcript
ELECTRICITY Value of mains supply = 230V
ELECTRICITY Fuse is used as a safety device Prevents too much current flowing in circuit.
ELECTRICITY Power of appliances measured in watts (W)
ELECTRICITY Plug wires colours Live brown Neutral blue Earth green/yellow Fuse in live position
ELECTRICITY Double insulation no earth wire required as casing of appliance is plastic non conductor
ELECTRICITY Human being is a conductor of electricity so do not touch wires ,do not come into contact with water with electricity.
Electricity PARTS OF THE RADIO 1. AERIAL - PICKS UP ALL SIGNALS 2. TUNER SELECTS ONE PARTICULAR SIGNAL
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 COLOUR MIXING 3 PRIMARY COLOURS RED , GREEN , BLUE TOGETHER MAKE WHITE
TELECOM RED AND GREEN GIVE YELLOW. RED AND BLUE GIVE MAGENTA GREEN AND BLUE GIVE CYAN
TELECOM GEOSTATIONARY SATELLITES ARE AT A HEIGHT OF 36 , 000Km ABOVE THE EARTH THEY HAVE A 24 HR ORBIT
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 = I x T P = I x V P = V2/ R RT= R1 + R2 1 /RT= 1/R1+ 1/R2 V = I x R P = E / t P = I2R
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 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 2. BLUE NEUTRAL
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 IPx VP= ISx 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
