TELECOM

1
TELECOM

• SPEED OF E .M .WAVES
• 3 x 108m/s
• 3oo,ooo,ooo m/s

2
TELECOM

• SPEED OF SOUND WAVES
• 340 m/s in air

3
TELECOM

• EQUATIONS
• v f l v d /t

4
TELECOM

• Frequency the number of waves per second
• Measured in Hertz (HZ)

5
TELECOM

• CARRIER WAVE THIS TELLS YOU THE RADIO STATION
• AUDIO WAVE TELLS YOU WHAT IS ON THE STATION

6
TELECOM

• AMPLITUDE MODULATED (AM) WAVE A COMBINATION OF
  THE CARRIER AND AUDIO WAVE

7
TELECOM

• PARTS OF THE RADIO
• 1. AERIAL - PICKS UP ALL SIGNALS
• 2. TUNER SELECTS ONE PARTICULAR SIGNAL

8
TELECOM

• 3. DECODER SEPARATES CARRIER WAVE FROM AUDIO
  WAVE
• 4. AMPLIFIER MAKES BIGGER COPY OF AUDIO WAVE

9
TELECOM

• 5. BATTERY SUPPLIES ENERGY TO AMPLIFIER
• 6. LOUDSPEAKER CHANGES ELECTRICAL ENERGY TO
  SOUND ENERGY

10
TELECOM

• COLOUR MIXING
• 3 PRIMARY COLOURS RED , GREEN , BLUE TOGETHER
  MAKE WHITE

11
TELECOM

• RED AND GREEN GIVE YELLOW.
• RED AND BLUE GIVE MAGENTA
• GREEN AND BLUE GIVE CYAN

12
TELECOM

• GEOSTATIONARY SATELLITES ARE AT A HEIGHT OF 36 ,
  000Km ABOVE THE EARTH
• 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 EARTHS ATMOSPHERE

14
TELECOM

• OPTICAL FIBRES USED TO CARRY INFORMATION BY TOTAL
  INTERNAL REFLECTION. LIGHT TRAVELS AT A SPEED OF
  200 , 000 , 000 M/S

15
ELECTRICITY

• EQUATIONS
• Q I x T V I x R
• P I x V P E / t
• P V2 / R P I2R
• RT R1 R2
• 1 /RT 1/R1 1/R2

16
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

17
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.

18
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

19
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

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
• 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

23
(No Transcript)
24
(No Transcript)
25
(No Transcript)
26
(No Transcript)
27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
(No Transcript)
31
(No Transcript)
32
(No Transcript)
33
(No Transcript)
34
(No Transcript)
35
(No Transcript)