LESSON 6.3: DISTRIBUTION& TRANSMISSION OF ELECTRICAL ENERGY

LESSON 6.3: DISTRIBUTION & TRANSMISSION OF ELECTRICAL ENERGY

How do we get electricity at home?

Multiple Choice

RECALL 1: An electrical device that could increase or decrease voltage from one electric circuit to another by the principles of electromagnetic induction.

• Transformers

• Generator

• Dynamo

• Power station

Fill in the Blanks

Multiple Choice

RECALL 3: The place which generates a sum of electrical energy using a generator.

• National Grid Network

• Factory

• Power station

• Transformers

Multiple Choice

What is the amount of voltage generated by a power station?

• 7 kV or 20 kV

• 11 kV or 25 kV

• 33 kV or 50 kV

• 172 kV or 235 kV

Multiple Choice

The electrical voltage generated by the power station is not enough. How to increase the voltage?

Multiple Choice

The step-up transformer increase the voltage from 11 kV or 25 kV from the power station to ...................................

• 50 kV or 100 kV

• 455 kV or 725 kV

• 132 kV or 275 kV

• 1002 kV or 2025 kV

Multiple Choice

Name the network that involved in the transmission of electricity to residential, commercial or industrial area.

• Cable Network

• Transmission Network

• National Grid Network

• Fibre Optic Network

Multiple Choice

Name the station that reduces the voltage (step-down transformer) before supplying to the residential area.

• Substation

• National Grid Network

• Power station

Multiple Select

Select ALL the advantages of National Grid Network.

• Connects all the power stations

• Electrical transmission will not interupted

• Provides additional power to area in need

• The cable is made of iron or zink

Multiple Choice

What is the amount of voltage needed in each residential house?

• 120 V

• 240 V

• 480 V

• 600 V

Multiple Choice

Name the type of wire that distributes alternating current from the substation to consumers?

• Live wire

• Neutral wire

• Earth wire

Multiple Choice

What is the type of wiring system needed by residential houses?

• Single-phase wiring

• Three-phase wiring

Multiple Choice

Single-phase wiring system is suitable for residential area because its enough for electrical energy usage not exceeding 10kW or 50A.

• TRUE

• FALSE

Multiple Choice

Three-phase wiring system is suitable for industrial area because it needs less amount of electrical energy.

• TRUE

• FALSE

Multiple Choice

This device located beside the electrical meter to break the circuit if a fault in substation causes too much current to flow.

• Main fuse

• Main switch

• Fuse box

• Circuit breaker

Multiple Choice

Protects a house circuit from damage caused by a large current or overloading.

• Fuse box

• Main fuse

• Main switch

• Circuit breaker

Multiple Choice

Breaks the circuit by tripping its switch when the current flowing through it exceeds the rating.

• Main switch

• Main fuse

• Circuit breaker

• Switch

Multiple Choice

Name the wire that returns alternating current from the house to the substation.

• Live wire

• Neutral wire

• Earth wire

Multiple Choice

Name the wire that brings out excessive current into the earth to prevent damage of electrical appliances.

• Live wire

• Neutral wire

• Earth wire

Multiple Select

Name the two type of plugs.

• 1-pin plug

• 2-pin plug

• 3-pin plug

• 4 pin plug

Multiple Choice

Choose the correct type of plug for electric radio or printer.

Multiple Choice

Why microwave or electric kettle needs to use a 3-pin plug?

• It uses less amount of electrical power

• It uses high amount of electrical power

Fill in the Blanks

Multiple Choice

Which of the wire carries alternating current to the electrical appliance?

• Live wire (Brown)

• Earth wire (Green & yellow)

• Neutral wire (Blue)

Fill in the Blanks

Multiple Select

BONUS QUESTION: Beside the live wire (brown), you will find a device known as fuse. What is the function?

• Breaks off cicuit if excessive

• Prevents damage to appliance

• Distributes current

• Reduce voltage

Poll

CONGRATULATION! YOU HAVE COMPLETED THE LESSON. DO YOU LIKE THIS METHOD OF SELF-LEARNING?

• LOVE IT

• MADE ME WISER

• I DON'T UNDERSTAND AT ALL

• I NEED TO REPEAT THE LESSON

• I NEED SIR TO EXPLAIN