Telecommunications

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Slide 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

Slide 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.

Slide 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

Slide 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

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

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