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

2. ELECTRICITY Fuse is used as a safety device Prevents too much current flowing in circuit.

3. ELECTRICITY Power of appliances measured in watts (W)

4. ELECTRICITY Plug wires – colours Live – brown Neutral – blue Earth – green/yellow Fuse in live position

5. ELECTRICITY Double insulation – no earth wire required as casing of appliance is plastic –non conductor

6. ELECTRICITY Human being is a conductor of electricity so do not touch wires,do not come into contact with water with electricity.

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

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

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

10. TELECOM COLOUR MIXING COLOUR MIXING 3 PRIMARY COLOURS – RED, GREEN, BLUE TOGETHER MAKE WHITE 3 PRIMARY COLOURS – RED, GREEN, BLUE TOGETHER MAKE WHITE

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

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

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

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

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

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

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.

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

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

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.

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

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