6.3 Transmission and Distribution of Electricity

The flowchart shows the sequence of the components in the electricity transmission and distribution system.

Power station -----> _____________ -----> National Grid Network ----> Main substation ----> _____________ ----> _____________ ----> Branch substation ----> Step-down transformer

• Switch zone, step-up transformer, step-down transformer

• Switch zone, step-down transformer, step-up transformer

• Step-up transformer, step-down transformer, switch zone

• Step-up transformer, switch zone, step-down transformer

The voltage of alternating current, a.c., is ___________ before it is transmitted through the National Grid Network.

• increased

• decreased

The voltage of the alternating current is highest at the

• power station

• National Grid Network

• branch substation

The _______ enables electricity to be transmitted to the branch substation when needed

• Switch zone

• National Grid Network

• Transformer

2-pin plugs are not connected to the earth wire.

• TRUE

• FALSE

Mei Ling got an electric shock while ironing her clothes. The following information shows the steps taken by his brother to help her.

P- Calls an ambulance

Q- Remove electrical source using an insulator

R- Switches off the main power supply

S- Perform mouth to mouth resuscitation if the victim is not breathing.

Which sequence is correct?

• P, R, Q, S

• P, Q, R, S

• R, Q, S, P

• R, Q, P, S

Choose the step-up transformer

• A

• B

• C

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

_______ carries electric current to an electrical appliances.

• Neutral wire

• Live wire

• Earth wire

_______ returns electric current to the branch substation.

• Neutral wire

• Live wire

• Earth wire

_______ connects an electrical appliances directly to the Earth.

• Neutral wire

• Live wire

• Earth wire