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UNIT 1: INTRODUCTION
1.1 Importance Of And Need For Electricity In Daily Life
1.2 Other Forms Of Energy Converted From Electricity
1.3 Energy Resources
1.4 Generation, Transmission and Distribution of
Electricity
1.4.1 Electricity Generation
1.4.2 Types of Power Station
1.1 IMPORTANCE OF AND NEED FOR ELECTRICITY
Importance of
electricity
To function
s
Industry applianc
es
Domestic
appliances
EXAMPLES OF ELECTRICITY APPLIANCES
1.2 OTHER FORMS OF ENERGY CONVERTED FROM ELECTRICITYHeat Energy
Light Energy
Sound Energy
Mechanical Energy
Electricity
1.3 ELECTRICAL ENERGY RESOURCES
Friction
ChemicalReaction
Light
Heat
Magnet
Pressure
HOW ELECTRICITY FLOWS TO ITS USER?
1.4 GENERATION, TRANSMISSION & DISTRIBUTION OF ELECTRICITY
Electricity GenerationDirect
CurrentCurrent flow in one direction
Alternating CurrentConstantly
changing its flow direction
1.4 GENERATION, TRANSMISSION & DISTRIBUTION OF ELECTRICITY
Examples of DC and AC generation
DC •Battery•Sun cell•DC Generator
AC •Power Generator (Power Station)
1.4 GENERATION, TRANSMISSION & DISTRIBUTION OF ELECTRICITY
HYDRO-ELECTRIC POWER STATION
Operation:• water flow from a dam •Turn the turbine•Rotate the generator to generate voltage
THERMAL POWER STATION
GAS POWER STATION
Operation:•Compressor - compresses a gas to produce high-pressure air (cooling part)•Combustion – burn the gas used (fuel)•Rotate the generator to generate voltage
HEAT ENERGY
Current
Heating Element
Heat Energy
LIGHT ENERGY
current
Light/lamp
LightEnergy
MECHANICAL ENERGY
current
Motor Coil
Rotor Spin
Mechanical Energy
SOUND ENERGY
current
Audio Circuit
SoundEnergy
FRICTION
Friction
2 different material
Electrostatic force
/Silk cloth
CHEMICAL REACTION
Zinc + Copper + electrolyte
Electric Charge /
Electrochemical Reaction
LIGHT
Light
Surface
Photoelectric Effect
HEAT
Heat
Two different
material
Seebeck
Effect
MAGNETIC FIELD
Cutting Magnetic field
Induced
current
EMF
PRESSURE
Pressure
Crystal
Piezoelectri
c Effect
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