Electricity (4.3 How can we use electricity safely?)

What is the voltage of the mains socket in Singapore?

• 30 V

• 110 V

• 150 V

• 230 V

Which of the following are the common electrical hazards?

(You can choose more than 1 answer)

• damaged insulation

• damp conditions

• overloaded circuits

• Using appliances with voltage rating lower than 230 V

• Using appliances with a safety mark

Which of the following is the consequence of misuse of electrical appliances at home?

• electric fire only

• electric shock only

• electric fire and shock

• none of the above

Label the parts of a mains plug. (Seperate your answers with a comma)

Part A is the __________.

Part B is the __________.

Part C is the __________.

Part D is the __________.

(a)  

Which wire is attached to the fuse in a mains plug?

• earth wire

• live wire

• neutral wire

• all of the above wires

What are the correct colour of the wires in a mains plug?

• live: blue

  neutral: green and yellow

  earth: brown

• live: green and yellow

  neutral: blue

  earth: brown

• live: brown

  neutral: blue

  earth: green and yellow

• live: brown

  neutral: blue

  earth: green and yellow live: brown

  neutral: blue

  earth: green and yellow

The fuse is a safety device that blows and ______ the circuit when the current in the live wire becomes too ______.

• breaks, small

• breaks, large

• connects, small

• connects, large

The earth wire is a safety wire that prevents electric ______ by allowing _______ to pass through it rather than the body.

• fire, current

• fire, voltage

• shock, current

• shock, voltage

What is the safety feature shown in the picture?

• fuse

• earth wire

• safety marks

• circuit breakers