Chapter 6 Generation Of Electricity

Question 1

What are the 2 main electricity groups?

Answer 1

Renewable energy sources and non-renewable energy sources

Question 2

Definition of renewable energy sources?

Answer 2

Energy sources that can be replaced continually and will never deplete

Question 3

Definition of non-renewable energy sources?

Answer 3

Energy sources that cannot be replaced and will deplete

Question 4

Examples of renewable energy sources

Answer 4

Hydro
Wave
Solar
Tidal
Wind
Biomass
Geothermal

Question 5

Examples of non renewable energy sources

Answer 5

Nuclear
Coal
Natural Gas
Petroleum

Question 6

What is a generator?

Answer 6

Device used to generate electricity

Question 7

What is electricity current produced by?

Answer 7

Movement of the wire and movement of the magnet

Question 8

Types of electric current?

Answer 8

Alternating current and direct current

Question 9

What is a direct current?

Answer 9

Current the flows in 1 direction only

Question 10

What is an alternating current

Answer 10

Current that flows in constantly reversing directions

Question 11

Examples of devices and sources of direct current

Answer 11

Flashlight, calculator, solar cells, batteries

Question 12

Examples of devices using alternating current

Answer 12

Hair dryer. air conditioner, bread toaster

Question 13

What the fuck is a Cathode Ray Oscilloscope

Answer 13

Electric device used to show the differences in the shape of graph, direction of current and voltage change

Question 14

What is a transformer?

Answer 14

Device for changing the voltage of an alternating current

Question 15

What is a transformer made up of?

Answer 15

Laminated soft iron core and 2 insulated coils

Question 16

Types of transformers?

Answer 16

Step up transformers and step down transformers

Question 17

Explain about the step-up transformer

Answer 17

The primary voltage across the primary coil is lower than the secondary voltage across the secondary coil because the primary coil has less turns than the secondary coil

Question 18

Explain about the step down transformer

Answer 18

Primary voltage across the primary coil is higher than the secondary voltage across the secondary coil because the number of turns on the primary coil is more than the secondary coil

Question 19

What is the supplied voltage of alternating current in malaysia?

Answer 19

240V

Question 20

Examples of electrical appliance that operates at 240v alternating current without a transformer

Answer 20

Electrical stove, heater

Question 21

Compare the ratio of the primary voltage to the secondary voltage and the number of turns of the primary coil to the secondary coil in a transformer

Answer 21

The ratio of the primary voltage to the secondary voltage is equal to the ratio of the number of turns of the primary coil to the number of turns of the secondary coil in a transformer

Question 22

Transmission tree of electricity

Answer 22

Power station > Step-up transformer > National Grid Network > Main substation ( switch zone/step-down transformer ) > Heavy industrial area/light industrial area/residential areas

Question 23

Amount of volts needed for heavy, light industrial areas and residential areas/offices

Answer 23

Heavy- 33 kV
Light - 11 kV
Office/Residential areas - 240 V

Question 24

Impact on residencies located near national grid network pylons?

Answer 24

If strong enough cause short term health effects such as dizziness and disrupts the position of the compass needle`

Question 25

Types of electrical wiring system?

Answer 25

Single-phase wiring/three phase wiring

Question 26

Limitations of single-phase wiring

Answer 26

Suitable and stable enough for electricity usage not exceeding 10 kW or 50A - Rural residential areas

Question 27

Limitations of three-phase wiring

Answer 27

Used in industrial/commercial areas where electricity usage is over 10 kW or 50 A

Question 28

Types of plugs

Answer 28

3-pin / 2-pin plugs

Question 29

Examples of appliances using 3-pin plugs

Answer 29

Electrical kettles Irons

Question 30

Example of appliances using 2-pin plugs

Answer 30

Hair dryer Electric toothbrush

Question 31

Colour of earth, neutral and live wire

Answer 31

Earth- Yellow and greens striped Neutral - Blue Live - Brown

Question 32

Safety components in the wiring system of a house

Answer 32

Earth Leakage Circuit breaker Switch Earth Wire Miniature circuit breaker 3 A, 5 A, 10 A and 13 A fuses

Question 33

What is a fuse?

Answer 33

A fine and short wire that heats up easily and melts when current flowing through exceeds the value of the fuse. If the wire of the fuse melts, the electricity supply cuts off

Question 34

Types of fuses

Answer 34

Cartridge fuses and replaceable wire fuses

Question 35

What is the function of a fuse?

Answer 35

as an electrical safety device, to prevent excessive current flow

Question 36

Types of fuse ratings

Answer 36

1, 2, 3, 5, 10, 13, 15, 30 A

Question 37

What is the importance of safety in the use of electrical appliances? Why?

Answer 37

To protect us because the ratio of deaths due to injury of electrical accidents is high compared to other categories of accidents

Question 38

What is the meaning of energy efficiency

Answer 38

It is the percentage of energy input converted to useful form of energy output

Question 39

What is the formula for energy efficiency?

Answer 39

Useful energy output/Energy input supplied x 100%

Question 40

Examples of technology which applies the concept of energy efficiency?

Answer 40

LED Bulbs and electric vehicles

Question 41

Examples of light bulbs

Answer 41

Filament Lamp, Energy saving lamp and LED lamp

Question 42

What is the function of an electric meter?

Answer 42

Measure the quantity of electricity used to determine the cost of electricity consumed

Question 43

What is the meaning of electric power?

Answer 43

rate of electrical energy used by an electric device

Question 44

What is the meaning of electric current

Answer 44

The rate of flow of electric charge through a conductor

Question 45

Definition of voltage

Answer 45

Electrical energy used to move a unit of electric charge

Question 46

What are ways to save electrical energy consumption

Answer 46

Construct green buildings Use energy-efficient appliances

Question 47

Features of a green building

Answer 47

Efficient ventilation system to reduce the use of air conditioning Maximising the used of natural lighting to reduce the cost of electrical energy consumption