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

RECALL 2: Name the type of electrical current that is distributed to the consumers.

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

Fill in the Blanks

Name this device that measure the electrical energy used.

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

Name the blue wire that returns the current to the substation.

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

Name the green and yellow wire found in 3-pin plug.

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

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