# TelecommunicationsPage 1

Slide 1

## Telecom

Slide 2

TELECOM

SPEED OF SOUND WAVES

340 m/s in air

Slide 3

TELECOM

EQUATIONS

v= f l v = d /t

Slide 4

TELECOM

Frequency = the number of waves per second

Measured in Hertz (HZ)

Slide 5

TELECOM

CARRIER WAVE –THIS TELLS YOU THE RADIO STATION

AUDIO WAVE TELLS YOU WHAT IS ON THE STATION

Slide 6

TELECOM

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

Slide 7

TELECOM

1. AERIAL - PICKS UP ALL SIGNALS

2. TUNER – SELECTS ONE PARTICULAR SIGNAL

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TELECOM

3. DECODER – SEPARATES CARRIER WAVE FROM AUDIO WAVE

4. AMPLIFIER – MAKES BIGGER COPY OF AUDIO WAVE

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TELECOM

5. BATTERY – SUPPLIES ENERGY TO AMPLIFIER

6. LOUDSPEAKER – CHANGES ELECTRICAL ENERGY TO SOUND ENERGY

Slide 10

TELECOM

COLOUR MIXING

3 PRIMARY COLOURS – RED , GREEN , BLUE TOGETHER MAKE WHITE

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TELECOM

RED AND GREEN GIVE YELLOW.

RED AND BLUE GIVE MAGENTA

GREEN AND BLUE GIVE CYAN

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TELECOM

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

THEY HAVE A 24 HR ORBIT

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TELECOM

SIGNALS ARE MICROWAVE AND TRAVEL IN A STRAIGHT LINE TO AND FROM THE SATELLITE.THEY CANNOT CURVE IN THE EARTH`S ATMOSPHERE

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TELECOM

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

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

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