ECM346_W3

Electrical conductors allow electric current to pass through them easily.

• TRUE

• FALSE

Electrical insulator, which means it does not allow electric current to flow freely and is used to prevent electric shocks

• TRUE

• FALSE

Which of the following materials is an electrical insulator?

• Copper

• Aluminum

• Plastic

• Silver

What is the main purpose of using insulating materials in electrical wiring?

• To increase current flow

• To make the wire stronger

• To prevent electric shock

• To conduct electricity faster

Which of these materials is commonly used as an insulator in household items?

• Steel

• Gold

• Rubber

• Mercury

Which part of a power cord is usually made of a conducting material?

• Outer plastic coating

• Inner rubber layer

• Metal wire inside

• Insulating tape

Why is copper often used in electrical wiring?

• It is a good insulator

• It is cheap and light

• It conducts electricity well

• It doesn’t rust easily

There are TWO types of conduit wiring; concealed wiring & surface wiring

• TRUE

• FALSE

Based on the figure, this is a surface wiring.

• TRUE

• FALSE

Two types of cable; overhead & underground

• True

• False