The 3-digit secret code from today's lesson is ......

Which of the following types of power stations is/are used in Singapore?

(Hint: more than 1 answer)

• nuclear

• coal-fired

• oil-fired

• gas-fired

Which of the following is/are disadvantages of nuclear energy?

(Hint: more than 1 answer)

• It can cause deformed offsprings.

  (Children who are born may have abnormal formation of body parts)

• It can cause air pollution.

• It can cause cancer.

• It can cause nuclear burns.

What is the name of the equipment used to produce electricity in power stations?

• transformer

• furnace

• generator

• turbine

Which of the following types of power stations produces the MOST amount of air pollution?

• oil-fired

• nuclear

• gas-fired

• coal-fired

What is the electrical device that changes voltage of an alternating current (A.C.) supply?

• transformer

• furnace

• generator

• turbine

Electricity is stepped up to ............... before transmission (sent to offices or homes).

• low voltage

• no voltage

• high voltage

• same voltage (to power stations)

If electricity is transmitted at high voltage, ............

• less energy is lost

• more energy is lost

• less energy is gained

• more energy is gained

The core of a transformer is made of ........................

• aluminium.

• copper.

• iron.

• silver

A network of electrical cables and electrical substations is known as an electricity ............................

• battery

• grid

• line

• wire