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ELECTRICITY ELECTRICITY Value of Value of mains supply mains supply = 230V = 230V

ELECTRICITY Value of mains supply = 230V Value of mains supply = 230V

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Text of ELECTRICITY Value of mains supply = 230V Value of mains supply = 230V

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ELECTRICITY Value of mains supply = 230V Value of mains supply = 230V Slide 2 ELECTRICITY Fuse is used as a safety device Prevents too much current flowing in circuit. Slide 3 ELECTRICITY Power of appliances measured in watts (W) Slide 4 ELECTRICITY Plug wires colours Live brown Neutral blue Earth green/yellow Fuse in live position Slide 5 ELECTRICITY Double insulation no earth wire required as casing of appliance is plastic non conductor Slide 6 ELECTRICITY Human being is a conductor of electricity so do not touch wires,do not come into contact with water with electricity. Slide 7 Electricity PARTS OF THE RADIO PARTS OF THE RADIO 1. AERIAL - PICKS UP ALL SIGNALS 1. AERIAL - PICKS UP ALL SIGNALS 2. TUNER SELECTS ONE PARTICULAR SIGNAL 2. TUNER SELECTS ONE PARTICULAR SIGNAL Slide 8 TELECOM 3. DECODER SEPARATES CARRIER WAVE FROM AUDIO WAVE 3. DECODER SEPARATES CARRIER WAVE FROM AUDIO WAVE 4. AMPLIFIER MAKES BIGGER COPY OF AUDIO WAVE 4. AMPLIFIER MAKES BIGGER COPY OF AUDIO WAVE Slide 9 TELECOM 5. BATTERY SUPPLIES ENERGY TO AMPLIFIER 5. BATTERY SUPPLIES ENERGY TO AMPLIFIER 6. LOUDSPEAKER CHANGES ELECTRICAL ENERGY TO SOUND ENERGY 6. LOUDSPEAKER CHANGES ELECTRICAL ENERGY TO SOUND ENERGY Slide 10 TELECOM COLOUR MIXING COLOUR MIXING 3 PRIMARY COLOURS RED, GREEN, BLUE TOGETHER MAKE WHITE 3 PRIMARY COLOURS RED, GREEN, BLUE TOGETHER MAKE WHITE Slide 11 TELECOM RED AND GREEN GIVE YELLOW. RED AND GREEN GIVE YELLOW. RED AND BLUE GIVE MAGENTA RED AND BLUE GIVE MAGENTA GREEN AND BLUE GIVE CYAN GREEN AND BLUE GIVE CYAN Slide 12 TELECOM GEOSTATIONARY SATELLITES ARE AT A HEIGHT OF 36, 000Km ABOVE THE EARTH GEOSTATIONARY SATELLITES ARE AT A HEIGHT OF 36, 000Km ABOVE THE EARTH THEY HAVE A 24 HR ORBIT THEY HAVE A 24 HR ORBIT Slide 13 TELECOM SIGNALS ARE MICROWAVE AND TRAVEL IN A STRAIGHT LINE TO AND FROM THE SATELLITE.THEY CANNOT CURVE IN THE EARTH`S ATMOSPHERE SIGNALS ARE MICROWAVE AND TRAVEL IN A STRAIGHT LINE TO AND FROM THE SATELLITE.THEY CANNOT CURVE IN THE EARTH`S ATMOSPHERE Slide 14 TELECOM OPTICAL FIBRES USED TO CARRY INFORMATION BY TOTAL INTERNAL REFLECTION. LIGHT TRAVELS AT A SPEED OF 200, 000, 000 M/S OPTICAL FIBRES USED TO CARRY INFORMATION BY TOTAL INTERNAL REFLECTION. LIGHT TRAVELS AT A SPEED OF 200, 000, 000 M/S Slide 15 ELECTRICITY EQUATIONS EQUATIONS Q = I x TV = I x R Q = I x TV = I x R P = I x VP = E / t P = I x VP = E / t P = V 2 / RP = I 2 R P = V 2 / RP = I 2 R R T = R 1 + R 2 R T = R 1 + R 2 1 /R T = 1/R 1 + 1/R 2 1 /R T = 1/R 1 + 1/R 2 Slide 16 ELECTRICITY RULES FOR SERIES AND PARALLEL CIRCUITS RULES FOR SERIES AND PARALLEL CIRCUITS VOLTAGE SPLITS UP IN A SERIES CIRCUIT VOLTAGE SPLITS UP IN A SERIES CIRCUIT CURRENT STAYS THE SAME IN A SERIES CIRCUIT CURRENT STAYS THE SAME IN A SERIES CIRCUIT VOLTAGE STAYS THE SAME IN A PARALLEL CIRCUIT VOLTAGE STAYS THE SAME IN A PARALLEL CIRCUIT CURRENT SPLITS UP IN A PARALLEL CIRCUIT CURRENT SPLITS UP IN A PARALLEL CIRCUIT Slide 17 ELECTRICITY VOLTMETERS MEASURE VOLTAGE AND GO ACROSS THE COMPONENT VOLTMETERS MEASURE VOLTAGE AND GO ACROSS THE COMPONENT AMMETERS MEASURE CURRENT AND ARE WIRED IN SERIES WITH THE COMPONENTS. AMMETERS MEASURE CURRENT AND ARE WIRED IN SERIES WITH THE COMPONENTS. CIRCUIT COMPONENTS INCLUDE RESISTORS, BULBS ETC. CIRCUIT COMPONENTS INCLUDE RESISTORS, BULBS ETC. Slide 18 ELECTRICITY MAINS ELECTRICITY MAINS ELECTRICITY WIRES IN THREE PIN PLUG WIRES IN THREE PIN PLUG 1.BROWN LIVE2. BLUE NEUTRAL 1.BROWN LIVE2. BLUE NEUTRAL 3. GREEN / YELLOW EARTH 3. GREEN / YELLOW EARTH FUSE IS A SAFETY DEVICE WIRED IN THE FUSE IS A SAFETY DEVICE WIRED IN THE LIVE PIN LIVE PIN EARTH WIRE NOT NEEDED FOR DOUBLE INSULATED APPLIANCES, THEY HAVE A PLASTIC CASING EARTH WIRE NOT NEEDED FOR DOUBLE INSULATED APPLIANCES, THEY HAVE A PLASTIC CASING Slide 19 ELECTRICITY MAINS ELECTRICITY MAINS ELECTRICITY THREE TYPES OF CIRCUIT THREE TYPES OF CIRCUIT 1. THE LIGHTING CIRCUIT 15A FUSE2. THE RING MAINS CIRCUIT 30A FUSE 3.THE COOKER CIRCUIT 45A FUSE 1. THE LIGHTING CIRCUIT 15A FUSE2. 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 ALL ARE WIRED IN PARALLEL IF ONE GOES OUT THE OTHERS STAY ON LESS WIRE USED SO MONEY IS SAVED Slide 20 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. Slide 21 ELECTRICITY TWO COILS OF WIRE WITH AN IRON CORE, THE PRIMARY COIL AND THE SECONDARY COIL TRANSFORMERS NP /NS = VP / VS IP x VP = IS x VS Slide 22 HEALTH TYPES OF THERMOMETER TYPES OF THERMOMETER 1. THE LAB THERMOMETER2. THE CLINICAL THERMOMETER BOTH LIQUID IN GLASS THERMOMETERS3. THE DIGITAL THERMOMETER 1. THE LAB THERMOMETER2. THE CLINICAL THERMOMETER BOTH LIQUID IN GLASS THERMOMETERS3. THE DIGITAL THERMOMETER DIFFERENCE BETWEEN LAB AND CLINICAL THERMOMETERS, SIZE,SCALE, MAGNIFIER IN CLINICAL THERMOMETER,KINK DIFFERENCE BETWEEN LAB AND CLINICAL THERMOMETERS, SIZE,SCALE, MAGNIFIER IN CLINICAL THERMOMETER,KINK Slide 23 Slide 24 Slide 25 Slide 26 Slide 27 Slide 28 Slide 29 Slide 30 Slide 31 Slide 32 Slide 33 Slide 34 Slide 35